>>1
I use it for java, it's pretty cool and has lots of useful features. The drawback is that its a lot harder to customize and extend than emacs, so your pretty much stuck with the tools they give you unless you go through the effort of writing a plugin. Also lots of people say it runs quite slowly, but I'm using pretty cheap hardware and have never had that problem with java at least. When I ran Adobe's flex builder it was slow as balls though(even though action script support is miles behind java support in eclipse). Support for languages other than java is fairly minimal, last time I tried it the C++ version didn't even have auto-completion.
>>11
Eclipse saves automatically every time you run, or just hit ctrl-s, to save without clicking.