I can understand why it appears this way from outside, but we've never been moving faster than we are now.
I have been on board for about six months, and in that time we have rolled out lots of usability and layout improvements: streamlined sign-up process, a new anonymous homepage, a consolidated and curated help center, completely rewritten search, new badges page, upcoming new privileges page...
In the next couple of months, we will be finishing sitewide SSL, redesigns of our more high-traffic pages, and a complete re-factor around closing to make that process more clear.
Stay tuned, because I'm excited about where we're headed.