It is really useful, and helps people get their problems resolved sooner.
Having other operators online is useful so you can conference with them if you don't know the answer, thus helping them out or getting help form them.
Admin . . . sorry about that, I didn't mean to enable it. Now I always check it's still disabled when I log on.
I know it's annoying and I wouldn't enable it intentionally.
And the type preview is useful, thanks for enabling it.
Not the be-all and end-all though, so if it causes problems then disable it again, it's not that important to me, just useful in certain situations.