Is Disk Utility's "Repair Disk" a viable TRIM solution for Mac OS X Yosemite?
Did you notice that the interesting bits in the discussion seem to point to Disk Repair having performed a TRIM because Trim Enabler was installed?
User jimsander says:


  My guess is it's a result of the 3rd party TRIM enabler - just did Disk Utility --> Repair on my machine (MacBook 2008 w/ Lion + Crucial SSD) and it didn't say it did a TRIM.


It would not make much sense if Disk Repair made a TRIM happen without Trim Enabler, because what is lacking by default for non-Apple SSDs (and that Trim Enabler provides) is driver support for TRIM. Disk Repair accesses the hardrives through the same driver that the filesystem implementation uses in normal operation, so it won't do the one-time TRIM without the same driver support that would allow the filesystem implementation to trim immediately.