Here's what I would suggest: Part with $400-500 to join your airline's airport lounge/club for a year. The saved time and stress vastly outweighs the cost if you fly more than five or six times a year--if you fly that much it's usually worthwhile to try to stick with a single airline anyway for the frequent flier miles and the perks they hand out to those with "Elite" status (or whatever your airline calls it). If you fly less often it makes more sense to just buy day passes.
Most clubs have showers, free wifi, numerous power outlets, free snacks and adult beverages and, most importantly, a quiet place to relax before your flight (and none of those annoying "The TSA has recently blah blah blah blah" announcements over the PA). Many airlines offer reciprocal benefits with other airlines' lounges (for example, when flying on Alaska, you can use the Boardroom at an airport without an Admiral's Club).
Earlier this week I had to catch a flight departing at 6:15am. Instead of waking up at 3am, I spent my mandatory pre-flight airport time taking a shower (shampoo, soap, a razor and, of course, clean towels complements of the lounge), eating breakfast (free coffee, muffins and an apple) and catching up on email.