I don't need benches, or a greenhouse- or even a garden for that matter I guess. I want benches - or should I say elevated surfaces. I don't think too many ppl would prefer to bend over and fiddle with things at ground level really.
Once full grown, plants would be fine on the ground, although I'd still prefer them elevated a bit I'd imagine.
I guess mainly I'm wanting benches for the smaller plants, potting, etc.