I recently started to dabble with Mistweaver (respecced my OS from BrM) and went through a few dungeons to get a grip on it and the gameplay and it was pretty fun and interesting.
One thing that got me though is constantly spinning around due to party/raid members being all over the place (if they are). I got into HFC LFR and during Iron Reaver I got so disorientated with people being so spread and me having to constantly channel Soothing Mist every time I want to heal someone.
Using mouseover macros on raid frames or just using clique/grid, vuhdo, etc. you don't really know where these people are and when you start spamming soothing it just gets really hectic.
Now I played other healers (Disc, Resto sham, druid, HPal, virtually all of them) and the only thing similar is when you cast Penance as Disc, but seeing as you don't need to channel it all the time it isn't really that much of an issue for me, or an issue at all for that matter.
How do you guys deal with this? Does it even bother you? I really want to know. Maybe it's just that MW isn't for me.. although I can't say I don't like the spec, I was just surprised with this kind of gameplay.