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Bob Weaver
Yep, they are viewing benches, and they were totally full the day I was there, with people standing behind them too. September 26, 2008. I sat on the edge of that wooden platform, on that very corner that you see in the picture. And as an aside, Old Faithful was much smaller and less impressive than I expected it to be. I found other geysers there to be far more entertaining, for example Clepsydra Geyser was far superior. Old Faithful was the only major disappointment on my trip to Yellowstone.
Yep - viewing benches. There are viewing benches at many major geysers. Steamboat goes off maybe once or twice a day, and they've got benches there. You can certainly sit on the edge of the boardwalk. They don't mind so much that anyone steps on the ground just inside the edge of the boardwalk as long as one doesn't head towards the geyser.
Of course I saw Giant, Grand, and Oblong go off at the same time in a summer day in 2006 (Giant was absolutely huge and erupted for over an hour):