Sorrry, but you don't understand what AE is and expect it to work in a fashion that it isn't designed for. That's all there is to it. It might be a good idea to clear your wrong preconceptions. AE is not an editing tool to begin with and then some... Start by actually reading the help, which clearly you haven't done.
A) Change your attitude if you really need someone to help you
B) IMovie is a editing tool - AE is a compositing, motion graphics, animation tool
C) if IMovie is so good - stay with it
D) being angry at a software that works different than some other piece of software is like being angry at french guy that can't speak english. You and french guy are communicating and gettung things done - but in different way.
and the most important thing
E) learn basics of a software before you start spilling hate on the web
Sounds like you might need your hard drive wiped and OS reinstalled. I'm not talking about your computer. I'm talking about YOU. Seems like you might have received some faulty programming.
It sounds like you want a video editing application. I would recommend Premiere Pro. It will do exactly what you are asking to have happen. That's because it is also an editing app. After Effects is not a video editing app, so please don't expect it to act like one. As others have mentioned, expecting an orange to taste like a coconut is just going to be frustrating for you.