LOL, I made the jealousy comment mostly for levity.
It sounds like you are in a similar phase of life as me ... I'm 51 now and the kids are both finally off to college, so I finally am starting to have time to do some of the things I have wanted to do for a long time. The colleges are limiting the disposable income part, but I still have a few dollars each month I can play with.
Unfotunately, the house is small enough that the wife claims to need to store stuff out there too. I've been kind of a jerk about it though and told her in no uncertain terms that she has only so much space and the rest is for the shop. After all, she has the entire rest of the house to organize as she wants, so it's only fair that the garage be mine.
I already have the floor. It is the Racedeck-like stuff in silver and dark grey. But I recently realized that there is a water management problem somewhere in the year that results in water collecting in the garage (under the tiles), so now I have part of them out to track that down.
I should snap some pics of where I am now and what progress I make.