It's a pain in the ass, but the added features of a more customized forum software should be worth it.
It has nothing
To clear some things up:
1) The forum linked at the top of this post is in no way related to the improvements planned to Pixelation (obvious I know, just making sure).
2) Pixelopolis is a temp forum. It has always been a temp forum, this is nothing new.

3) The old Pixelation had a couple issues with post quality and navigation that were exascerbated by having such a large userbase at the time; we planned on adding a few new features (post flagging/sorting, etc) that would smooth everything out if we ever saw that kind of traffic again. (There are much fewer people around now, but the overall user quality is at a high we haven't seen for a while imo. Hopefully the bandwagoneers, rippers, asspatters and me-tooers will be kept to a minimum through attentive modding :p)
4) Most people who talk about the "old days" are talking about the time around when they first joined. Not only is this pretty inaccurate to what Pixelation really was like in the beginning, but it doesn't even matter anyway. This isn't to sound snobby, it's just to say that these communities are an evolutionary thing; your "old days" are gone as are mine, and even if those circumstances came to be again, they'd be radically different from everyone else's perception of the "old days". We can't try to stop the community from changing, doing so is what led the GDR to stagnate and die and Pixelation to spin off in its own direction in the first place. What we can try to do is remain THE place for pixel c+c for the masses. To that end, we're going to build a bigger, better forum. If that's not worth having to take the time to reregister your username on said new forum, well then, that's your call.
Remember the 100 character rule? That was great.
Yeah, funny you should reminisce about that since it was put in as a countermeasure to stem the flow of crappy, useless posts. You don't want those days back do you? :p