Yes, I have.
There are two designers, in particular, who have been designing for over 3 years and I own 85% of everything they have ever made. I can't possibly remember every single thing they have created in this time, but pulling them up in ACDSee and getting to see all their goodies (which all work together as their quality and output has remained consistently good over time) at one time helps me to mix 'n' match their things together in a very aesthetically pleasing no hassle way.
ACDSee also helps a lot when you know you want to use this specific paper pack you own, but have no idea which alpha, for example, you want to use with it. Pre-ACDSee, I never used my paper packs simply because I didn't want to waste 30+ minutes wading through all my alpha folders, element folders, etc. trying to pull together my own kit as it were. Post-ACDSee, you can pull up the paper pack you want, get the paper(s) into PS, then pull up all your alphas at one time, and so on in a very efficient streamlined way. At the end of creating a page in this way, I feel so much prouder of what I have accomplished as I know I really looked through my stash and picked out the best alpha and elements possible rather than taking the lazy way and using whatever was most handy.