I've grown to rely on the assist, not that I need it, but that it lets me lean less on the clutch and start out more calmly, which is good as I've been ferrying around a friend to numerous doctors appointments and don't really want the inside of the Sonic decorated. Knowing when it will and won't engage is key though, a mild slope it's really not there, it has to be serious.
It has never made starting out difficult, I barely feel it getting in the way. The only problem I have is when I want to use gravity to back out of a driveway... it does overcome gravity for a couple seconds. Not an actual problem where I'm doing it, but I could see how if you had to back out into a busy road, that it might be annoying.