I'm happy with the "casual" label because I mean we don't spend more than 6 hours a week raiding, two 3 hour sessions.
I push the raid to beat clear times each week, I expect people to be ready to zone in and start pulling within 5 minutes of invites going out. They know to bring their buff food, flasks and be repaired. I give a 10 minute raid break mid-raid and other than that I expect to have zero downtime - which means we hand out assignments and talk strategy etc. while clearing trash. If anything we are always pushing to do more in less time, and we do push that hard.
Believe it or not, I don't run damage meters nor do I bother with logs and I've never looked at gearscore nor do I give a flying frak. I am looking for people doing what they were asked to do, not standing in the thing, using cooldowns/trinkets when i asked them to etc. I rarely ever have to say anything, and I do so privately in a tell if I do or in a general manner on vent if needed. I have been blessed with people who play well in this environment and frankly won't re-invite someone who needed too much attention unless they have mentor in the raid which has worked for some players.
That wall of text was simply to explain my definition of casual, i'm proud of it and we have fun which is the point.