"Everything has a different name, you have to keep looking things up"
Yes, there's not a lot you can do about that.
Also some concepts are so different that there aren't exact equivalents, and both systems have things that are easier to do on one than the other, or require a quite different approach to achieve the same goal.

"Firefox browser is very clunky. the pionter moves jerkily."
That's not a generic Linux problem. It's absolutely fine here. You might not have the right graphics driver - I've had funny mouse and graphics effects when the

"You have to type in two identifications every time you boot."
Not usually. You should need to log in only once, and if your system is physically secure you can choose automatic log in and not have to log in at all.

Anahata