I use Avianca's Lifemiles for cheap purchases of miles/mileage tickets that have low cancellation fees and allow for one-way tickets.

I use USAirways' Dividend Miles for relatively cheap purchases of miles to redeem for mileage tickets that I won't need to change in either direction. [The high cancel/change fees and the restrictions against changing the tickets after flying is one of the reasons why I don't invest more in the program.]

I use United's program for a plurality of my Star Alliance flight activity, mainly because I still fly UA a lot.

I use ANA's program for transferring points from other programs for select redemption purposes.

I use Scandinavian's program for intra-Scandinavia domestic flight redemptions since they provide me a very high CPM redemption value.

I keep an Aegean Star Gold account because it's so easy to earn/retain *G status with it.

Previously, I would pretty much consolidate at least a third of my Star Alliance flight activity in BD's program and sometimes even most of my Star Alliance flight activity. That era is over and now I'm diversifying across more programs than ever before as a result. In some ways, I'm better off now than ever before because of what the BD DC wrap up motivated me to do: get involved more deliberately with more programs and really up my gaming of them.