No doubt. I'm not saying I like my TT bike, but I dislike it less as I ride it more.
For me, enough time on it made it downright pleasant (on suitable rides, without major hills, turns, and traffic); my fit on it is much better than on my roadie, and much more comfortable.
I though have the advantage that when I race on it, I don't have to put myself on the verge of collapse at the end.