Hey fellas, just wanted a report back with my brake issue.
I ended up bleeding the system as recommended, and it seemed to fix the pedal issue for the most part, though it still seemed a little squishy.

With that, I decided to pull a front wheel real quick to check the condition of the pads, not that I suspected them to be the culprit, since the system should operate with relatively the same feel regardless of the wear condition of the pads, assuming nothing ridiculously low or worn. Well, it turns out that the pads *were* pretty worn down, surprisingly. They weren't metal on metal, but they were almost down to the wear indicator split. I would say that what was left was a little less than half the thickness of that of a new set of pads. There was more than 1/8" but less than 1/4" left on the pads. At $20 from the local parts store, I decided to replace them.

Things feel much better now, more back to normal. I didn't do anything with the rotors, as they seemed okay. Took a few miles for the new pads to seat a bit, but brakes are working pretty well again, and feel much more responsive than that sketchiness before.

Randy, this was a good idea. I hadn't gotten around to checking the rear, as I'd just replaced them recently, and this problem seemed to come on all of a sudden, so I never even considered that the rear shoes may be out of adjustment. I will probably give this a closer look the next time I do an oil change and chassis lube. I may just give the parking brake a few good pulls to "tighten" the clearance a bit, but the parking brake is working pretty well, so I figure the shoes have to be somewhat reasonably positioned.