If you want to hear some power, rev the engine on your pickup truck while you wait at a red light on your way to the job site. Or on your riding lawn mower; that works just as well.
That gas-powered engine (and the smaller handheld ones you'll work with on a daily basis) will account for most of the power gardeners have on the job. The average landscaper is just there to cut the grass and whack the weeds, and possibly even—we know we're getting crazy here—trim the hedges. There are very few landscaper unions, and thanks to the contractor nature of the job, you might not even technically be employed while you perform your gardening services.
You'll get paid, though. Probably.
There's too much competition within the industry for the average Joe or Jane to have much more power than the tools they use. Gardeners don't often get to make the big decisions, like the layout of the garden or the plants that reside therein. They're usually just there to water, seed, maintain, and otherwise be completely responsible for the overall beauty of acres of land.
Independent landscape artists and business owners will both have a lot more power on the job. The former will use their creativity to design everything from mazes to designer trees to energy-efficient gardens, while the latter will at least get to boss other people around all day.
That's something, isn't it?