That is about how I would have played it... I waffle between check call, check raise and lead to get raised a reasonable amount based on what my opponents have done before and what I put them on now. In this case I would have taken one off the top because of the raise preflop, smooth call in between, you are getting a fair enough price to make up your mind on the turn.

I check raised all in a guy that I had fold equity against that held only 99 in his raised pot with a pair and a two way draw last week. It was his time to make a stand but one card of half the freaking deck hit me this time

You really have to figure out the best plan of attack based on current opponents to manipulate them into playing your game.

A look at the odds and percentages now that we know all the cards:
Preflop
KK 60.7% QQ 16.6% 56c 22.7%
you outclass the QQ here in likelyhood of winning.... and by smooth calling with the other player in the middle only made a preflop error of 2:1 pot odds vs. 5:1 card odds. Implied odds more than makes up for this.

Flop 7d 2c 3c
KK 47.1% QQ 4.4% 56c 48.5%
You lead with even money, should you know the opponents hands, and called $5 into an $18 pot. I even like not going nuts here on a coin flip with some equity in the pot even if your fold equity is obviously zero. Recognizing opponents that aren't likely to fold to any bet and waiting to make a hand is best almost all the time.

Turn 7d 2c 3c 4d
You now hold the nuts and that can't be broke by their current holdings.
You make the bet that induces an all in and a call, although both players should have figured you for a set, by the weak lead, call a raise and lead again at the turn. Better opponents can slow down on KK here unless you have been using blocking bets and shown them.

Mathmatically you made less of an error preflop than if you called with 77 by calling with the connector as you would have only been 16.8% to win the hand. Either way working out this hand like this has given me a deeper understanding of true implied vs. card odds. Thanks.