I think it really depends on the seriousness of the relationship and what the decision itself involves.
Personally, I like it when my boyfriend plans our activities. He picks the restaurant or the movie or any other fun event (symphony, parks, concerts) etc.
However there is always choice involved with both of us. Sometimes I want to do something else or have another preference.
We never do anything that both of us don't agree to.
There is a lot of freedom and independence in our relationship and I value it greatly.
I do know that as we get more serious, we would be slowly aligning our lives together. Even at that point, I would hope that we would make decisions jointly.
The only time I would be fine with someone making a decision for me without my consent would be a spouse or a parent at the event that I wasn't able to do so myself.
Sometimes my bf has suggestions for me about some things. I hear him out, think about it and then decide whether I want to go that way.
(He's so smart though, I almost always agree with him ^_^ )
There is a lot of mutual respect.
I do trust him so in case there was ever an event where he had to make a decision for me (probably on my choice of drink) - I would be very pleased to see him do it
If he were to call up my workplace and tender in my resignation, that's a different thing altogether.