My guild is pretty passive about what I decide to do but I prefer not to dual my warrior/priest in raids where we are still learning.

Before BC came out 4 of us, two being my warrior and priest took on Ony for about 10-15 minutes before we died.. Ony being oh so close to going down before we did..

It was,
jmet -my 60 priest
jeru -my 60 warrior
another 60 warrior our MT
and our raid leader a 60 Pally

Shortly after everyone else wiped and it was just us 4 Jeru went down due to a tail swipe and the pally and I focused on our MT and there we stayed for what seemed like ages.

Would I do it in BWL absolutely not, would I do it if I was running two of the same class like Mages? You bet...