I think most are like me and have a dedicated freezer for frozen feeders. I also have dedicated round plastic storage containers that I use to thaw mine out. They look completely different than all my other storage containers so they never accidentally get put with my food containers...and are kept by the freezer.
Almost all of my snakes came to me eating f/t. I have had one so far that would only take live. I didn't attempt to force the issue of f/t on her. Each week I'd attempt f/t and she'd show no interest so I'd feed her live. She eventually decided to take f/t.
Years ago when I used to keep snakes, I only fed live because that's what I was told to do....it was best for them. It wasn't until I rescued a burm and watched the battle* I immediately looked for an alternative, which was f/t. All my animals had no issues making the switch either.
*ok it wasn't a real battle. I just couldn't stand watching the rat claw and try to bite my snake as it was being squeezed to death. I was scared he was going to hurt my snake!