Quote Originally Posted by EdibleWare
And I use those because I need a perfect detection, my game will use lot's of wall jumping and other stuff that I think only detectors can do perfectly (maybe I am wrong but this is the way I like to work)
You might want to check out my 8 directional fast loop movement example. It shows how to make 8 direction collisions using fast loops... which are as pixel perfect as you're going to get. Plus it only uses one object for the player collision.

http://www.clickteam.com/epicenter/ubbthreads.php?ubb=showflat&Number=216970#Post2169 70

I tend to find using a bunch of collision detectors is less perfect because you're just introducing more things that can malfunction. Simple elegance is best in my opinion. (not to mention good luck having to stick 4 or more detectors on each enemy)

My example could be very easily modified to include gravity/jumping with speed and velocity as well. In fact, I did just that for my current platformer game that I'm working on... so far it's performing above any of my expectations.