You sound very frustrated about Photoshop.
I've been using Photoshop CS, CS2 and CS5 since 2005 and sure, in the beginning the software were really difficult to use, but as time goes (and software upgrades) you learn the program and also know how to change the layout of it.
(Like, moving around the windows and such, the bar is usually just set and you've gotta learn it the hard way by clicking around)
Now, I'm not at all familiar with CC and I probably won't get it either (because I'd like to buy the program instead of having it on a subscription and right now that seems to be impossible).
You said you've got a pen & touch function on the tablet?
Have you tried turning off the touch function?
That could actually be the cause of your problems, I've noticed the same thing on my wacom Intous Pro M, even though I ran it with a MAC.
The Touch function made everything weird, sometimes the pen pressure changed, the brushes were deleted and what not D:
And as others has stated, Photoshop was mainly made for photo editing, but lately have understood that artists enjoy working with the software (as do I) and thus started to advertise it as a program for artists as well.
So it's made for 3 different groups of artists, painters, graphics and photo editors. Hence why there's so many tools you probably won't even know there is.
Paint Tool SAI and others, like Clip Studio are completely made for artists and which is why those programs run a bit different and are easier to learn and understand as all the tools are developed by and for artists.
(And I don't think Photoshop sucks? When I used it on windows, it was laggy as hell, it took forever to start up and it was overall terrible. Switched over to MAC, and it ran perfectly?? Takes less than 10 seconds to start up, saves fast and isn't laggy!)