Not familiar with True Launch Bar. I need two rows because when I have lots of apps open, I quickly run out of Task Bar real estate, especially since I have so many quick launch shortcuts and tray icons I want access to.
Even with a single row, though, if I'm not careful and mouse too low, it's still a problem:
Does everyone have the ToolTips pop up almost immediately? I did a fresh XP install, hoping it'd go back to a default setting with a more rational hover delay, but to no avail...