Thanks for that & to Dave for pointing out that the commands are still there under "Navigation". I'm having to use the "4-squares" (what do you call it?) menu, but my fingers are conditioned to hit that key-combo and it's disconcerting to say the least when an unexpected file appears.
Update: A little more experimentation shows that if I have foo.m, foo.h and footest.m, that key combo cycles between them. So I guess it's a "feature".
And the control-drag in IB now works for me, so I must have been having an off day.
Sorry for the waste of bandwaidth!