OP, I feel your pain. This season, I got back in the water after a surface interval similar to yours. The tech at my LDS told me he wouldn't recommend I invest in the cost of inspection for my old Dacor Pacer. Geez, I really liked that old reg. I remember it was just about the only piece of gear I bought new when I was a young diver. My old gear, in general, just screamed 1980. I was pleased that my old steel 72s passed hydro. The girl at the shop looked at me like I had a horn growing out of my head because one of my cylinders had a J-valve and my old AquaLung BC had a CO2 cartridge and my old Healthways mask looks like something out of a James Bond film. I'd taken the BC off of the backpack and just dove on the backpack years ago for shallow dives. So, I had to buy a couple of straps for my Mares Power Planas and for my old Jets, and I had to let go of my favorite Dacor mask because the nose pocket was rotted -- but a couple of bucks and a little research later, and I'm good to go.
Oh, and don't feel bad about the wetsuit. Empirical evidence would tend to suggest that time has a shrinking effect on neoprene. I found a sweet 7mm farmer John and shortie for $30 after a swap meet at my new favorite shop where they don't look down their noses on serviceable vintage gear.
I got back into the water again this season after a bit of research and study, and I felt perfectly confident again right away. If you've got the least bit of hesitation just take a refresher course or dive with an experienced buddy you trust. Go along with your LDS group on a fun dive or two. It's a nice way to build confidence and to see what kind of gear others are diving on, too. You might be pleasantly surprised to find that a lot of divers are using "vintage" gear as part of their set-up and that they're having a blast. Good luck.