Wow you need to wait that long when exitting a building? outch! its in the range of 10-15 seconds here and thats the max ive ever waited.
Are you playing on console? If so what region?
Note it varies. It's not always that long, just sometimes.
For me though it doesn't bother me. Once you played on a Tandy TRS-80 and had to wait upto an hour just to load a level I think 30-40 seconds is a cakewalk, haha.
Mass Effect 1 & 2 had some pretty lengthy load times aswell, in the first they masked them by using elevators, but in the second you had to sit on a loading screen, which was quite lengthy in places aswell even installed to HDD (cargo elevator on the normandy comes to mind here, lol). So with that in mind a bit of loading doesn't make a game bad, neither is it a massive inconvenience, at least not in my opinion.
while its true that being about unable to tell one potion apart from the other in hotbuttons its pretty easy to remember which you allocated for HP and which for mana tho :p The overall accuracy of your post is right on tho
How easy it is to remember is entirely dependant on the person. I normally have to go back to my house a minute after I have left it to check if I locked the door or not. :p