1) Leveling was too fast rather than too slow. I guess you mean 2 months is a horribly long time, but i'd have made it 2 years instead.
2) Yes, a part of the gameplay was to read (and understand) quest texts. There was 3rd party websites like Thottbot you could use for guidance but figuring out the stuff was needed in order to get things done in vanilla. I see no problem here.
3) Mounts were luxury items you could buy if you were wealthy, not an item you could add in your collection. Again, works like intended.
4) And thank god for that. Bad players didn't get reward for showing up. If you wiped 10 times at the 1st boss you should have acknowledged there was something wrong in your group composition and leave.
5) That's not true. Only healers used different spell ranks for light, moderate and heavy heals (makes sense if you think about it). Other classes may have used some spells as rank 1 because of its effect (rank 1 frostbolt for slowing effect, or rank 1 earth shock for spell interrupt).
6) That's right, raids were quite hard in vanilla and you wanted to have all the possible buffs you could find before going in. That also gave you something to do when it wasn't a raid night. No 'instant action' button was available.
If these are the things you find uncomfortable then maybe this is not a game for you. Have fun in Legion or Bfa or w/e and forget WoW:Classic.