I don't know about "kickers" (I use them, but I wouldn't call them the norm per se) ... the problem is though - with the kind of light Bud is describing - one has to either make the choice to either use it to illuminate the subjects (at which point of the day it's going to be VERY warm quite quickly (and before too long, weak, where shutterspeeds will drop to 1/20th or less at 1600 ISO @ any F-Stop respectable enough to retain a decent D of F (say F5.6)) -- or to put it behind them, in which case one has to compete against it (unless one wants silhouettes).
Competing against the light makes for great shots, but one needs the lighting rig(s) to be able to produce quality light ...
I'll give you some examples ...
This was shot about 1/2 hour (or slightly more) before sunset, using a couple of gelled 580EX IIs into a shoot-through umbrella ...
This was shot (about 1/2 hour after sunset) with 2x gelled 580EX II into a shoot-through unbrella, with a 3rd gelled 580EX II providing a bit of fill from camera right ...
This one was shot after sunset with 2x Naked gelled 580EX IIs - it's and "ok" shot for what it is, but not the kind of thing that's particularly flattering to a model in a wedding dress ... and Bud is only going to have - perhaps - 1/4 of the lighting power I've had available here. I think I'd be inclined to try to start the shoot a little earlier to have a better quality of natural light, and cooler temperatures, and shoot from a tripod if one is going to use the (non-IS) EF 24-70/2.8: USM - trying to illuminate a full wedding dress with a single 430EX II as the light drops is likely to be "lambs to the slaughter" I'm afraid