I experienced the exact same thing myself far as the inability to get mine as easily as pre vas directly after my vasectomy (amongst other sexual side effects).
I experienced it pretty bad, and for quite a while after my first reversal too. At that point, I was also experiencing less sensitivity far as my johnson goes.
Here’s my poor wife, she bought into vasectomy doesn’t change anything except for having sperm in your ejaculate. She too would tell anyone that vasectomy can make it harder to climax. She finds it to be unenjoyable for the most part.
I got a lot better over time, but sometimes I still have way more stamina than I would like to have.
Sometimes my wife is totally not into long sessions, and I find myself frustrated wondering if it’s ever going to happen. That’s not fun either.
Having surgery down there messes things up short term at minimum for many. I’ve seen many men report the same problem as @Gilles_Boudreau.
A lot of men just don’t talk about this stuff. Ask any random guy that’s had a vas if anything has changed, and he will likely say no. You have to ask around, and/or dig/pry deeper to hear the details.
I’m not saying everyone experiences the exact same stuff. Sexual side effects tend to be all over the board, and vary in intensity.
Nobody wants to admit they have any problems, and/or sexual side effects post vasectomy. Vasectomy is a trade off. You don’t get something as such (sterilized via vasectomy) with zero consequences.
I’ve even talked with a guy that worked at a reversal guru’s practice about this same subject. He had a vasectomy, and openly admitted there was a trade off.
FYI, there is a dedicated “sexual side effects” thread on this forum. It might be worth a read.