You have a few other options though,
First is to continue using the group finder, but note those people you worked well with. Exchange BNet IDs and run with those people.
The second is to get in on XMog runs that seem to be fairly common.
Third you can solo any raid before MoP and a few of the MoP raids. Remember, they are going to automatically scale to 10 man difficulty so boss health will be lower than LFR instances.
I am not saying it will be easy, or even fun at the start. I know I made the mistake of joining an alliance group for some legacy raids here from the forums. I was treated so inconsiderately I will never do it again(with those people) and I will be far more cautious if I were to ever raid old content with forum members, but that has much to do with play style. When I raid content I expect the other raiders to gave actually looked at the content before, know the mechanics, show up on time, and not have to beg for an invite. I send out invites starting 10m before the scheduled time. 5 minutes before schedule I send out summons if available, at time I pull. If you are not there, see you next week. Miss 2 weeks with no response? I drop you from the invite list. Sign up as a healer and you don't heal? I switch you to dps. Don't dps? Dropped.