Think of it this way: how often do you think you would really get to enjoy more power from a M340 vs your 330?
I kind of feel the same as you do sometimes, in that I also have some remorse about getting a 330 rather than a M340 (part of which is probably caused by me spending too much time on this site
). But when I remember that ~90% of my driving is in heavy traffic situations, I then think I made the right decision.
Enjoy your 330i. It’s still way more powerful than the majority of cars you see on the road.