I think you do get use to the power, I took my Sierra to work 6 days a week and I was the same thinking it was slower?, when I took a mate out for a drive he was like "thats fast" but it didn't feel it to me.
Now ive got a van I use for work as my insurance ran out on the cos.
I took the sierra for a drive last week and because I havn't drove it everyday like I used to, it felt very quick and I did have a grin on my face.