I grew up with HO and my Dad's tinplate at Christmas. Loved my HO trains but something about Lionel made me wish I had them. Fast forward to about 4 years ago when my In-laws found a box of old tinplate freight cars. Built a layout (albeit small), and started down the garden path.
I've got post-war, MPC, and "vintage modern" as I like to call it (Lionel and MTH), Williams and WbB, and lots of K-line. I run all conventional using blocks to park trains. Scenery is a mix of things, no operating accessories as they take up too much room to fit my space. The third rail doesn't bother me, but 2-rail scale is impressive.
Might switch to modern controls one day if I build a bigger layout but for now what I have is fine.