Maybe you can't comment/it isn't appropriate to comment slewis but my experience is that Googlers who leave with just their regular option grant don't really walk away with anything spectacular in terms of wealth from the stock. Also factor in that salary tends to market-rate and rarely more.

However, it is known for engineers working on successful teams and products to obtain additional grants that can lead to them leaving Google with several $million worth of stock.

I'm not sure if slewis's 'absolutely' answer is based on something like the latter - in which case you have to make sure you are working on high-value projects that are going somewhere.