Since Sears was caught forcing reaffirmations on people, they have been pretty quiet in BK court (so we've heard). Other creditors who would use the same tactics as Sears tried probably would be watching their P's & Q's as well.
From what I've read here, there are very few creditors who show up or try to really push reaffirmations. Worst I've seen here is Best Buy and Circuit City, but they apparently don't push all that hard.
As for creditor harrassment during BK and after your discharge, it can and does happen. During your BK you have to be tough with any of them that are stupid enough to defy the automatic stay and all you give them is your BK case number and info and tell them that if they continue to harrass you you will file a complaint with the BK court and they'll be fined and sanctioned. You just have to be tough !! Same for post-discharge -- stay tough, keep copies of your BK papers, creditor matrix and discharge papers at hand and ready to mail to any dirtbag who calls you afterwards. They too would be in line for fines and sanctions for violating the BK laws.
The key for you is to make sure you include EVERY original creditor and every single collection agency that might have been assigned an account. Pull your credit reports prior to your filing and again before your 341 to make sure that nothing 'new' pops up, and if it does, that you modify your filings to add them.