I play on the lowest settings possible on a crappy laptop and... I didn't have a problem? The visual indicators are very obvious, especially the aoes do give you enough space to find the safe spot. Standing in between the lasers is their safe spot too, and you only have to move a little bit so you don't get clipped by an aoe. And literally for the last boss the things to avoid are super obvious. I don't know what to tell you. At level 90 I would probably expect this difficulty, which isn't particularly difficult or unforgiving by any means, but it is a step up from previous dungeons so you can't just face roll during bosses.
The last boss is especially obvious with indicators too. So... I have no idea what the OP is talking about.