Visual Studio 6 had the 'Go To Definition' (and 'Go To Declaration' functionality) just like Visual Studio 2005 & 2008. Oh, actually, not quite like those two.
For some reason, not only are the 'Go To Definition' an 'Go To Declaration' actions added to their stack, but so are a lot of cursor movements, particularly 'Find' and 'Find Next' (maybe just those, but it seems like more than that).
Maybe this works for people who only discovered this feature since VS 2005 came out, but for those of us who used it before, this change has made the 'Go To Definition' stack just about unusable. There's too much, plus I don't care to go back through my searches - if I did, I'd just search again!
Is there a setting somewhere to make it go back to the way it used to be?
I wonder if it's a keyboard mapping thing? I'm using the Visual C# developer keyboard map now, and the Go To Definition stack seems to work okay. CTRL-SHIFT-7 and 8 navigate as expected. Are you using CTRL-minus?