The time you can save with Vim can be significant, depending on the task. However what I think is far more valuable is that Vim doesn't get in the way; it doesn't impede the all-important "flow", and perhaps most importantly it stops you getting bored.
When your muscle memory develops to a certain point, using Vim becomes a subconscious thing. You don't have to think about how to copy all the text in between two quotes and paste it at the end of the document; there are already words in Vim's vocabulary for doing that, so you just do it. You don't need to build mental steps because it becomes completely natural, as easy as typing natural English; and just like in natural language, the more words you know well, the more likely you are to be able to use the right word at the right time, using language effectively.
Equally valuable: Vim takes the repetition out of everything. A technically versed creative mind is wasted on any repetitive task. You should never, ever have to do anything more than twice in development. You should be able to repeat and automate tasks and scarcely think about it. In Vim, this need is met by skilful use of . to repeat actions and q to record macros.
When you edit text optimally, you can concentrate on the task at hand, and the editor stays out of your way and does exactly what you need it to. You don't need to build the "subtask" of making your editor do what you want; you can just do it. I think that people who focus on the time Vim does or doesn't save you are missing the point.
If nothing else this might help put the kibosh on the intensely annoying way Facebook users tend to use cutesy fake names so that you don't know who the hell they are when they comment on your posts.
That, and heading off future competition. If Google were planning, for example, on releasing a multi-protocol web chat application of their own in the next few weeks, this would be a well-timed move.
Using Meebo's code base to make their own application might have been preferable to rebranding it in this case.
I found NERDTree had no advantages for me over just plain :Vex. I'm sure it does have other features, but how whizbang does a file browser need to be, anyway?
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