I can definitely attest to that, Trekker. About 5 years ago, I worked at Six Flags Over Texas for a couple of seasons and I can't begin to tell you how many people I saw arguing about where to go next. It was pretty funny to go on my lunch break and come back 45 mins later to see the same group fighting (not angry, just arguing)...
A personal story, too. In 1998, my parents took me and a friend to WDW. One day at Epcot, my friend and I decided we'd like to stay in FW while my parents did WS. No problem. We decided to meet at Innoventions at 3:00. Well, I thought the planning was through and started to go towards Spaceship Earth. What I didn't realize is that my parents tried to tell my friend that we'd delay until 4:00 (and every hour on the hour) if it was raining, cause they didn't want to walk that far in the rain. He, nor I, heard them and sure enough it rained. It was raining at 3 and at 4, so they finally showed up at 5. Meanwhile, we waited for 2 hrs. on them, and they thought we had heard and understood the plan to meet at the top of the hour in which it stopped raining. All this in order to say, make sure your party knows what the plan is...cause you could end up waiting on folks who don't know you're waiting on them!