I'm not in a rush, I just can't stand the difference between how quickly I *can* play the game (well - not rushed), and how long it takes to *actually* play.
With no one in front of me, playing alone, and *not* rushing, I walk 18 at my local muni in 2 and 35 minutes (only just over 6000 yards). I walk quickly, but I take a practice swing for my shots. I don't 'stalk' my putts, but I do take more than a glance at the green. When I play with someone else, we can finish in around 2 hours and 50 minutes.
Since I know that's how fast the course can be played, I get annoyed when I get stuck behind people, and it takes 3 and a half hours to get through. I can't stand watching someone go through a Na-like routine: multiple practice swings, backing off the ball, starting over.... that drives me nuts!
I won't bother to play during peak hours, and I get really irritable if a round goes over 4 hours. In fact, it starts screwing up my game
When I play other courses, it's not the total time that bothers me, it's the wasting of time by people in my group and in front of me. I've played longer courses and ones that are less walker-friendly, and I don't mind when those get closer to 4 hours (or just over 4 hours). But wasted time bothers me.
I'm not looking for 'speed golf', but it would be nice if more people knew how to play 'ready golf' (and if they were, in fact, 'ready' to hit the ball).