United completed the best start to a Premier League season with their 5-0 mauling of Bolton at the Reebok Stadium on Saturday.
The result maintained the Red Devils' 100% start to the defence of their title and took them on to 18 goals, 13 of which have come in the last two fixtures.
Even injuries to Tom Cleverley and Jonny Evans could not halt their progress, with Wayne Rooney netting his second successive hat-trick and Hernandez marking his first start of the season with a typical predator's double.
And, ahead of a Champions League trip to Benfica and a showdown with title rivals Chelsea at Old Trafford next weekend, Hernandez admits there is a special blend at United just now.
"There is a lot of excitement about this team," he said.
"Everyone knows about Bolton but we played very well. We created chances and scored goals.
"Scoring early settled us down. Once you are up in front, the other team needs to go towards your goal. Then you can start to attack more."
Hernandez took just four minutes to open his account, evading Gary Cahill with some textbook off-the-ball running before tucking home Nani's low cross.
Rooney converted a virtual replica effort midway through the half, with Phil Jones the provider.
Jones' talent has already become obvious since his summer move from Blackburn.
Had his mazy run from halfway ended in his first Premier League goal, it would have been an early goal-of-the-season contender.
Instead, after Jussi Jaaskelainen had saved with his feet, Rooney netted the rebound.
The onslaught continued after the break, with Hernandez finding the net once more before Rooney completed his seventh United hat-trick, the same number as Sir Bobby Charlton.
In doing so, he was also becoming the first United player to score back-to-back hat-tricks in the league since Alex Dawson in 1960.
His eight Premier League goals this term mean he has netted more on his own than every team aside from United and Manchester City, and is only three adrift of his total last season.
"Wayne Rooney is unbelievable," said Hernandez. "He can do anything on a pitch."
There is clearly a special chemistry between the striking duo that first came to light in the second half of last season.
It is frightening to think what might have been achieved if Hernandez had not suffered concussion on the pre-season tour of North America that prevented the Mexican playing a full part in the opening games of this term.
However, now he has made a full recovery, the striker is eager to make up for lost time.
"Scoring goals gives any striker confidence," he said.
"But the most important thing for me was that I managed to play 90 minutes for the first time because I have been out for two months.
"I could have scored three myself but I only play to help my team. I will keep working for that to enable us to get more points."
It was not a perfect day for the visitors given the injury to Cleverley following a foul by Kevin Davies, which upset Sir Alex Ferguson and is likely to rule the midfielder out for three months at a time when he had just broken into the England ranks.
Clearly, Owen Coyle suffered just as much but in a different way as he struggled to comprehend how his team could perform so well in patches but end up getting so badly beaten.
"We had double the shots, treble the crosses and David De Gea made some great saves," said the Bolton boss, whose side have now been beaten by Manchester City, Liverpool and United on successive weekends.
"But if you gift up time and opportunities around your own box, you will pay a heavy price."
Coyle's problems are of no interest to United, who head to Portugal with further doubts over the fitness of Jonny Evans (hip) and Patrice Evra (knee) but in buoyant mood.
"This is a great team," said Hernandez.
"There is a good blend of young people and experienced ones.
"Also you have someone like Phil Jones playing right back, and Chris Smalling did it before. Both play centre-back but they can change positions really well.
"That is really important."