OK. Getting back to us as white. I had a little time tonight to do some more research (call me Otello ;-)), and one thing we have to realize is that they have access to the same research we do. The lines we are playing now are not super popular but they have been played and documented, so we can bet they are looking at them.
From what I see, Bb5 has been played 15 times in the database I am looking at (365chess.com - you have to sign up to see it, but it's free and easy).
If black plays hxg5 (played 8 times), white wins 2 games, black wins 2 games, and 4 games are drawn.
If black plays axb5 (played 6 times), white wins 0 times, black wins 4 times, and 2 games are drawn.
If black plays Qxa2, (played 1 time), it was a draw.
So in 15 times playing this line at the highest levels, white has won twice (white won 13.3%, black won 53.3%, and it was drawn 33.3%).
Conversely, playing Otello's suggestion of Bh4, without going into too much detail, white has much better stats (in 27 games, white won 44.4%, black won 37%, and it was drawn 18.5%).
The thing that really surprised me was the stats on axb5. And going through some of those games it is interesting that it just appears that the material is just too much to give up for the queen.
So I guess all this is to say that while I am still willing to play Bb5 because I think it is a totally cool line, I do think we should maybe start looking a little more at Bh4. It is amazing how these lines have been played lots of times before - heck, one line was played exactly the same for the next six moves or so in 21 games.