I found a quiet C2 that had nothing but a single POS in it. That's right, no citadels. Amazingly, the POS was online and the corp was using it. Truly old school. Here's how life used to be:
The C2 that I just moved my corp into last month only had towers (two of which were online and in use). We actually roll into them more often than I expected, but there's definitely a lot of Upwell structures in wormhole space.
Takes me back to when this all launched and I led a very small, inconsequential corp in W-space for a while. POS life was a PITA.