Jim,

I would answer that by saying if you travel like we do with two bags each and a carry on, yes. If you pack light and have one carry on and one rolling suitcase each then you might walk it. You can walk in a straight line (with a little zig zag) across and then through the parking lots or you can walk around the U but then it really is too far. How much time would you have between flights would also impact that answer. Since your flight to NZ would require you to check in as if you hadn't flown that day, I think you'd need two hours minimum between your flights at least.

Editing to add that your could also get a Smarte Carte for $2-3 and roll everything across that way too. Timewise, the shuttle is not constant so walking will take as much time as the shuttle will. Traffic can be bad depending on time of day and departure level and arrival levels are different too!