Ummm, I'm guilty of this sometimes, but I have an explanation...
If you are referring to plans like going out for the night, I personally don't like it to be completely planned. I prefer more of a "see what we want to do as the night goes on" kind of attitude because I do enjoy some innocent spontaneity from time to time. I have never really thought about it as making a planner "wait", definitely not my intentions, but I appreciate seeing that now. Maybe the person you are waiting on, likes evenings out to be more spontaneous and he/she isn't maliciously making you wait? Usually I know ahead of time what date, time and place we are meeting at, but anything after that I tend to play by ear; of course I do plan ahead if I need to, like making reservations, or buying tickets in advance, or if it's a special occasion.