For me, it depends on the item itself. Some things are "single use" and don't generally get the same degree of intensity.
The original example (of clamp racks) would definitely require some heavier-duty construction. The weight matters and construction methods have to account for it. Glue and screws.
Lighter-duty items, like temporary tapering jigs, might just need a couple of narrow-crown staples.
As [member=384]Scott in Bend[/member] said, a 21ga nailer can be a very useful thing. They make a hole that is nearly as small as 23ga, with more holding power. The fall somewhere between 18 ga brads and 23ga pins....quite literally. The one caveat is that they will not pull a joint together, like staples can. The pieces need to be well fitted (tight to each other)
Many of mine are temporary, so they are made from plywood off-cuts and/or 1/4" MDF.
I also keep a supply of threaded inserts, nuts, bolts (1/4"-20), and knobs to match. They work well for jigs with adjustable fences (slots)
I get rid of drywall screws, like they are some kind of plague, much preferring construction screws that are intended for the cabinet industry. They have #2 Robertson heads, rather than that abhorrent Phillips.