Okay, first of all, no, I don't miss it. The main reason I could never get into the old school TR games was that they didn't seem like real adventure games, they seemed like boob games with some adventure in them (much like how Dead or Alive is a boob game with some fighting). Yes, people CAN be busty and still do a lot of this stuff... but why should they have to be? As a reboot, they can tweek whatever they like, and I think much of what they aimed for was based on realism, which is why the whole look is so different, there's more effect of dirt and blood on Lara, etc. and a woman with tits the size of her head, while it does happen, is rather uncommon. It's more REALISTIC that she seem a bit more normal.
Now, that being said, one of the most common moves I've seen in the bit of the game I've played is jumping across a gap, with her chest practically smashing into a rock face. That's gotta be rediculous enough with a C cup. If you've got what the original poster referred to as "a lovely g cup" I'm sorry, but you're not getting your weight anywhere near close enough to that rock, and you're falling to your death. I think a smaller, more svelt look for Lara makes much of what she does more feasible.
And I dunno, call me crazy, but I play a game for the quality of the game, not to see big boobs. That's what strip clubs, porn, nightclubs, etc. are for. What I want from a game, first and foremost, is to be fun to play.... part of that is immersing me in the experience and making me believe the story, and a more "real" looking Lara did a lot to help that.
Not only do I NOT miss old Lara... I vastly prefer new Lara.