I don't play the Queen's Gambit much any more, but the few times I do, I have always found the Rubinstein line very strong against the Orthodox:
1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Qc2!
Now 7...c5 (Black's only move as far as I am concerned) 8.Rd1 and you have a game with 3 results.
Against anything else, ESPECIALLY 7...c6, which I see a lot of amateurs play, the answer is 8.O-O-O and White will conduct a kingside pawn storm.
In fact, another sucker move that lowly amateurs play, after 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Qc2! c6? 8.O-O-O, is 8...h6? All you do is give White a hook, and at the moment, White won't even move the Bishop. 9.h4!! advantage White!
I'm still in awe of the variation after decades of playing it. I can see why it was so popular for a half century before WWII.
I've never found it boring... and knowing it is extremely solid defensively... that belief have saved a few games where I was in positions where I would have given up and taken the 0-1... The way people play aggressive these days... that aggression just plays into that defense.
I also see the precursor to many other defenses found in it.
Anyone else seriously play the Orthodox?