Which app to manage my photos?

3k in one folder
500 in other
Rest in other folders making up around 10 different folders.
My first thought is that the 3k in one folder is what is slowing you down.
I would try to limit the count to no more than 1k per folder.
 
Lullabyss: Yes, for sure. I saw it. There is a lot of funny stuff going on the facebook page of the Rat Pack Challenge. Check it out if you got some spare time.
To be honest in comparrisson to the other apps that I tried, like QuickPic and Piktures, the little hamster app helps me the most. Those other apps are just good for managing your photos and store them somewhere. What I really needed was something to sort out my pictures and keep the best ones. Thanks to everyone for the recommendations. I'm happy that I found something good, that is really helpful :-).