I also used pressure treated lumber and was glad I did. I got quite a few years out of them, even the 1x6s, and when they did self destruct I could just throw them on the compost pile or bury them. Also, by the time they are done I usually want to try something new anyway. I made a terraced herb bed, which the mints have taken over despite my efforts at corraling them.

The price of veggies and this forum have inspired me to get back into veggies this year. I use raised beds for most veggies, but I am going to try three sisters for the biggers stuff. We have a wet spring so raised beds help alot, especially when they are new and they don't have to thaw and drain.