You can teleport!
Woah, how far are we talking about here?
Mmm… about yay big, like 5 metres.
Right… I guess I can spam it zip zap zoop behind the enemy.
Nah, it’s about once per 20 seconds.
Errr… Well I guess I can go through wall, right?
Mmm… yes, if the door is open!
I see, moving on, what other skill do I have?
You can smite enemy with meteor from the sky!
Yea, and I can smash door with it! Problem solved!
Actually… not exactly…
Teleport is probably best movement skill in whole game. I agree with that door/wall. That is idiotic.
I guess moving 5 metres can be a challenge sometimes…
(I mean, seriously, like when you are frozen and surrounded)
Nonetheless this is all true!
I am really trying, but missing your point. Btw my effective CD for teleport is about 5 sec max. Maybe you are doing something wrong.
I can see that. Plain as mud! 
Hope you are feeling better mate. Keep working on yourself and in time you will defeat that ugly boss door 