This is totally it for me. I have a few Google accounts (an 'original' one and two Apps For Your Domain ones for e-mail and work) and it seems Google has made Plus accounts for each and I have things spread around them all. I've seen stories where people tried to "merge" accounts and ended up losing access to their mail, etc.. so rocking the boat doesn't seem worth it to me.
I don't mind Google's (usually great) services but it's the binding together that makes me wary.