Features are great when you need them. But when you don't need them, they shouldn't be negatives. Incidentally, I don't think it was really features that made VS2010 slow.
Why are they using Visual Studio at all then? Why not Textpad/Notepad++ or Emacs if they're so concerned about startup time? The only IDE that does come close to VS in functionality is Eclipse and that has a woefully slow startup time - never stopped any Java developer from touting that as the greatest IDE ever (it exceeds VS in many cases, IMO). Both of these IDEs, once they load, are extremely responsive considering the scale of the projects they are made to handle. JIT compilation occurs for chunks of code as you type code - that is dazzlingly fast for VS (and it's not just plain symbol-based lookup as used to happen in VS6 IntelliSense).
Incidentally, I don't think it was really features that made VS2010 slow
What do you think makes it slow during startup? According to me, it's sub-component/assembly/library load time during IDE startup and file parsing/symbol loading time during/after project-load.We can speculate all we want on what the deal is with VS2010; I'm just happy 2012 seems faster.
However, paging-in after idle-time is pretty similar, in my experience for both 2008 and 2010 (2008 fares worse for large solutions - especially if they have web projects in there). Build times are actually faster for VS 2010 (especially if you're on x64 - where it can use multiple cores). Symbol-loading when attaching to a process to debug is way faster for VS 2010 than in 2008. Detaching from a process also seems to have less negative consequences - VS 2008 just crashed in many cases.
However, VS 2010 is way too chatty in debug trace outputs. Also, slightly slower in parsing includes for IntelliSense after project load (not so during build though, funnily enough).