Ahhh... to be 23 again...
Haven't heard anyone chime in on the 767 yet, so I will. I suppose the most important reason I like the 76 over the larger 747, 777, A340, etc. is that the gauge of the aircraft seems near perfect. By this I mean:
1 - The aircraft isn't so huge so that dozens are waiting in line for the lavoratory;
2 - The smaller gauge allows for quicker meal/drink distribution/collection, as well as a little better "personal attention" from the flight attendants;
3 - It's a little easier to board and disembark because there are fewer passengers;
4 - I'm drawn to the 2/3/2 in coach (never one seat away from the aisle), and the first/business class seats typically provide plenty of room as well.
Well, anyway, you get the idea...