We try to be pretty responsive to user feedback, so I wasn't entirely surprised when Steve IMed me for some design suggestions on the [+] and [-] buttons you can now see to the right of every comment score and time.
It turned out the reddit community was pretty pleased and a self post about the new feature rocketed up the front page yesterday. There were still a few bugs to work out, but everything should be collapsing and expanding now with ease. No more orphaned or hidden children.
Happy birthday, mom!