It's really great - the only time now I need to rename *by hand* is if I want to run any programs like SimPE directly onto the game version I've been playing. HCDU, luckily, seems to work while the game is running.....
It took me a little while to set the file up, as I'm not very good with Dos programs, but once I got it right, it's made a big difference.
Another thing I do, which I think helps with load times, is I put all my walls, floors, roofs and terrain paints outside the Downloads folder. They work perfectly well from just inside the The Sims 2 folder, and just seems more logical to me - in Sims 1 walls and floors were, if I remember correctly, put separately from objects and clothing.