I told myself I was going to wait and see how long it took for me to get the update, but then I read about the TRIM functionality. I broke down and did the Services Framework trick and got the update. I had to uninstall then reinstall my Google account, and all was well. It broke MX Player, but I knew that going in. I definitely had a device that got laggier over time, and I would clear the cache partition weekly to get the zippy-ness back.
My Nexus is nice and quick again after the update, but I'm pretty certain the TRIM command hasn't run yet based on the criteria I've read. Time will tell, but so far so good.