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I posted about this on the PS2 forums but the post got pushed to page 3 in a hurry, no sense in just trying to bump it.
Anyways, I forgot about my solid state drive that was in my netbook so I pulled it out and put it into my PC and copied PS2 to it and loaded it up- what a massive difference.
From clicking "PLAY" to appearing in the spawn tube took about 60 seconds on a 7200rpm HDD, but takes 6 seconds on a SSD! PS2 by far has the largest gain on loading speed of all games I've tried on SSD, games like Guild Wars 2 and Battlefield Bad Company 2 and Battlefield 3 and Call of Duty games hardly gets any decrease in load times but some games do benefit- City of Heroes and SWG were other ones.
So if you don't have a SSD and hate tapping your finters waiting for the game to load, find a cheap 60GB one for $50-70, that's enough space for 2-3 most frequently played games.