I immediately cringe at every single instance I see "it's like X for Y!" At this point has this snow clone passed into the irony space? Is everyone using it ironically at this point?
Used well it provides cut-through of your brand / product / message in a way that is harder to build organically. Once you have traction, you can build a more separate identity.
Used inaccurately, and you will likely annoy people who might be your target market. Used ironically, you can definitely have fun.
But what would I know - my business advice is like Pets.com for Trappist Monks.
And if you are going to try it, test it first. Use your little catchphrase and then ask your friend what they think that means you do - 'Dropbox for Hackers' doesn't necessarily mean "code sharing that just works" - it could be interpreted as "making your private code accessible by our internal team" or "yay - unexplained conflict errors all over the place".