I have done the sneak dailies quite a few times and I have never been aggroed while invisible, so I'm not sure what the issue is there. On average, each set of 3 dailies takes me maybe 10 minutes to do, so 20 minutes would get me through all 6 in a day. It does get a bit tedious having to do the same thing over and over again every day but at least it's over quick.

Until you hit one that requires a FATE item. Waiting for those ones annoy me to no ends. I'll gladly take any sneaking or carrying tasks over FATEs any day.