Since the plane I fly, and the kind of flying I prefer, due mostly to my home strip's challanges, is elgible for the LSA (light sport) catagory, and even though I had held a full blown private pilot single engine land/SEL ticket for a lot of years, I switched over to the LSA system. NO physicals, ever! I still have a plane I can cruise at 100 mph in (though rarely do, mostly 85), that has a 6-700 mile range, that can carry one passenger and a small amount of gear (or just me and a LOT of gear). I can't night fly (don't want to anyway), or have a plane that grosses out at more then 1320 lbs., or fly faster then 138 mph. The thing is, if you fail a 3 rd class medical, it is a pain to get it back. And if you do fail one, it then TOO LATE to go LSA. So realizing my kind of flying, low and slow, was the way I wanted to aviate long term, I opted out before any health issues. If I for some reason want to trade on up to a Bonanza or any plane that requires a SEL, I can still do so, I'm not locked in the LSA catagory forever.
I did this the same year Idaho changed the CDL physical check up requirements, for some years I was having to get a phys for the FAA, AND one for the CDL! In Idaho anyway, there are many rigs that require a CDL, but not a bi annual physical:farm trucks, tow trucks, big well drilling rigs, etc., boom trucks or cranes were not specifically listed, but I managed to get them to add them to the phys exempt ruling.