Gregincal, thanks for "defending" my statement. Sorry, yes, it was meant for SC-laden areas, but still I oversimplified. There will always be situations, as others indicated, where 100% charge will be necessary, even with SC's less than 100 miles apart. Hopefully, the need for 100% charges will decrease with the increased density of SC in 2016 and beyond. Edit: I just noticed that WA (if you also count a couple of SC's in the ID/OR border area) has more stations than TX, so TexasEV's comment is certainly justified (hopefully TX will overtake WA soon).
In defense, perhaps the person I observed was planning to drive along the coast on highway 1 and couldn't charge at Petaluma 60 mile to the north. Or perhaps, they were without home charging. In any case, it wasn't a big deal to me since I only waited 5 min extra, insignificant compared to the previous 12+ hours of driving earlier in the day.
I plan to "stretch" my battery legs in the future and will certainly have a few more 100% charges. I look forward to cross country trips, excursions into western Canada, and other trips south. That said, I did charge to 100% in Burlington, WA (walked 1/2 mile for breakfast) when I was heading up to Vancouver Island (no additional SC's for a couple of days). A few weeks ago I charged to 100% at Pendleton, OR while watching a movie (not needed, but since I was the only occupant of the SC, I didn't worry about blocking). I try to be respectful and move out of the SC as soon as possible and leave contact information. All of this behavior comes from reading about J1772 station congestion in more heavily populated areas and my experience with the Leaf and single charging point stations. Here in eastern WA, we have few charging options, but few EVs. If it weren't for home charging, I wouldn't have purchased my Leaf back in 2011.