I know northrop, I just want to have what I need, not what I want.
I find with the 18-55, I usually have to step back several, or I don't get the pic.
I bought the 75-300 a couple days after ordering the 70-200 f4L, because a week and a half previously (before I impulse bought the f4L), I committed to buying from a guy in Chicago since I was going to be there, from craigslist.
I tried it for a few days before I got my f4L, then when I got it, I shot a football game, and the images just weren't as sharp, but that's expected. And with the acquisation of the 100-400 L (needed this badly as 200mm wasn't enough zoom for me), I really have no use for the 75-300 in my bag. It's taking up space.
As far as settings, I have progressed to Manual mode. =) Teaching myself slowly. It's pretty easy!
What are you shooting that you can't hit with 18mm?
The Canon 10-22mm is one the widest lens on the market. There may be better, but not much wider. (Sigma makes a 8mm fisheye)
I will agree with 200mm not being enough at times. However, much longer than 200-400mm you're talking big bucks.