I've gardened in raised beds for years, 4x12, now that I've also got a huge 30x35' garden out back I don't know what to do with it! No raised beds out there, hubby likes to rototill too much. So, I use that space for the big stuff, like corn, tomatoes, pole beans, squash, cukes, etc. Everything else goes out front.
As for pressure treated, the beds in the front yard were built by my father 28 years ago. The bad PT, but it didn't kill us, and I'm sure by now it's leached, if it did leach at all. There's no hair growing out of our eyeballs or anything, so I'm going to go on in blishful ignorance. However, if I ever rebuild them, they'll not be made of PT.