Welcome!
Valves are solid lifter types, shim under bucket with a 16,000 mile service interval. Due to the V-4 arrangement, and the easy access, checking the valve clearances is a relatively simple task. Being that it is a Honda...unless you are sitting at 6,000 rpm a majority of the time I.E. racing the bike stop light to stop light, the specs will almost always be in. Talking to most mechanics with the V-4 on the ST1300, I understand they rarely go out of spec.
I am one of those that will check the clearances myself, but after a while I just listen to the top end noise and can tell if I have one clicking a little louder than normal. I had a BMW with 16,000 mile checks, and after 44,000 and never serviced, there wasn't any problems when the mechanic checked them. I think if you ride bikes in a normal style riding, you won't have to worry about the valves at all.
It is weird that the Harley Davidson is one of the few bikes that uses a hydraulic lifter. Must be due to the anemic redline of 5,500 or somewhere in that neighborhood. I know of one guy who had a ST 1100 that had over 100,000 miles on the bike, and didn't know he was supposed to check the valves. Oil consumption wasn't even a teaspoon every 3,000 miles, and this guy rode bikes hard...like ping the limiter every other weekend to make sure it was available ???
I think you will like your CTX 1300 a lot. Adjust those handlebars to fit your reach, and enjoy the comfort of the Goldwing with less weight. You give up a little on the wind protection, but overall, it is one of the more comfortable "touring" bikes out there. Plus...it acts like a bagger around town!