Nope - I think its also gimmicky. I've never had the desire or need to encrypt anything on any computer I've ever used and doubt 90% of Mac users do either.
Seems like its something they are doing to pad out the feature list of lion.
Among other things, I keep my business' financial data in an encrypted folder. I don't see how having a methods of keeping files safely encrypted is "gimmicky". I do understand how you may not have any data worth safe keeping but that's just you.