On the other hand, right after I upgraded my SSD, I went to ruby 1.9.2 and rails 3, which are much slower due in part to a bug that makes requiring files take forever.
I think this is because, although sandforce drives have native garbage collection, it can sometimes happen at a very inopportune moment (like say, a 20s "pause" during critical moments of a SC2 game).
What this does is actually pretty simple, it replaces the string “Apple SSD” (used to identify for which drives trim is turned on) in a file in the relevant kernel extension with zeros. It also creates a backup copy of the original file.
The Trim Enabler you linked to replaces a whole kernel extension (meaning you might end up with an older version of a kernel extension) which is obviously monumentally stupid.