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>No, what I found out is that regardless of EnabledViewState property on each postback the GridView's current page (last visited page) is preserved. I would assume it would not be preserved when I set this property to false.
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>Other than that I didn't notice any side effects by disabling the ViewState for GridViews. The page started to load quicker, of course.

I don't really use GridView, so I don't know exactly what behavior is different when viewstate is enabled or disabled. It's different for every control (in some cases some events won't fire when viewstate is disabled). For some controls, it hardly makes any difference whatsoever. For the GridView, it's probably posting back some of it's data that isn't persisted in viewstate.