Could we have the feature to put Collections into folders (Sets and subsets) avoiding lengthy lists of Collections.
Chris Bassett commented
Yes I agree. It would be helpful if people could create folders in Bridge in which to place Collections (sort of how Collection sets work in Lightroom). This is probably the single-most annoying missing feature in Bridge that would make it so much better, and I don't think it would be terribly hard to implement (I mean, they could just read the physical file/folder structure from the disc and build the Collections tree from that).
I strongly agree with Peter. Collections are very powerful - particularly smart collections, but by allowing them to be put into sets it means that it will be much easier to organise your assets.