Look.. I am going to be brutally honest. If you don't use mitigation skills while running dungeons, you're bad.
If you want to do single pulls, use buffs so the healer doesn't have to spot heal you and a regen will suffice..
If you want to do big pulls, then use buffs so the healer can still nuke.
Even if you're doing baby pulls - USE THEM.
It is so simple to press 1 button every 10-20 seconds to rotate your large list of mitigation skills, and takes the job of healing you from completely horrible and tiresome to easy.. It's frankly lazy and bad play if you don't.
Also, if you're unsure what I am talking about - spend the short 5 mins of your life it takes to watch the following video.
That is all.