I was wrong.
The best reason to upgrade is "vacuum" does a lightweight non-exclusive-locking approach by default.
This is SOOOOOO much faster. 7.1.3 vacuum analyze would take well over an hour; it got bad enough that I had to lock out nsd while the vacuum ran so contention didn't nearly kill it. With 7.2.1 I won't have to resort to this hack, thank goodness.
I nearly waited until 7.3 to upgrade; I'm glad I didn't.
