I don't actually bother with set view myself. Since Warcraft defaults the camera to a certain angle when you're walking forward, I use that to line my characters up. Here's my method:

1. Start every character from exactly the same viewpoint. The easiest way to accomplish this is to have them zoomed in to first person (usually the Home button or just mouse wheel up until you can't zoom in any further.)
2. Zoom them all out to the same level by turning on mouse/keyboard broadcast and slowly zooming out. I do it slowly because sometimes one of the slaves will miss a tick on my mouse wheel.
3. Level all of the cameras to the same point. I do this by keeping broadcast on, then left-click and hold and push view forward and down until I'm looking almost straight down at my characters. Next, with broadcast still on, I walk them forward until the cameras level out.

These steps put them all at the exact same zoom and vertical level, making it simple to gather nodes. I also don't bother trying to match my main with my slaves when I'm gathering small nodes. Instead I will make sure my slaves are all over the node and start them gathering, then I'll turn off broadcast and gather on my main. This really only happens with small nodes or when my main is at a significantly different elevation from my slaves (i.e. gathering a mining node on a slope.)

Once you get used to doing this, getting your characters' cameras set at the same zoom/height takes a matter of seconds.