We care a lot about the pain that is affecting you now, and Xcode 6.1.1 available now as a GM Seed should address the worst of the SourceKit, DerivedData and module cache issues (among other bugs).
It has been wonderful to see Chris Lattner (father of Swift) taking such an active role in the developer forum discussions about the language and platform. It's a big step away from Apple's notoriously quiet attitude about works-in-progress.
Today's release of Xcode has seemingly eliminated many of the nagging issues that have been plaguing Swift development for a while. I haven't seen any SourceKit crashes and haven't had the module cache issues that previously had been wreaking havoc.
Twitter seems to agree, here are some reactions from other developers:
Well, after a good hour or so of bashing at my Swift project I haven't seen a single crash in Xcode 6.1.1. Xcode dudes, well done!— Tony Arnold (@tonyarnold) November 14, 2014
Autocomplete works again in 6.1.1 GM omgomgomgomgomgomgomgomgomgomgomgomgomgomgomgomgomgomgomgomgomgomgomgomgomgomgomgomgomgomgomgomgomgomgo— Ash Furrow (@ashfurrow) November 14, 2014
It appears that the Swift tooling is finally becoming stable enough to work with on a regular basis. With this latest release, I've been able to debug Swift code and work without any issues for a few hours.
I'd like to say thanks to the all the teams at Apple for their hard work getting things up and running.