I know the Alexa toolbar of long ago was a horrendous thing, and the Yahoo toolbar gets constantly installed without asking first (I hope they’ve changed that policy since), and both seem to be throughly annoying and resource heavy. But I’ve never found the Google Toolbar to be a big deal.
Having said that, I liked their button array a lot, where you could click them and it would search on the word you had in the field. But now they’ve changed the way it works, and it only goes to the front page of the site when you click the button, and you have to actually type the word again. What the hell? Why would I need buttons that do that on the Google toolbar, when I can (and do) already place the same links in my bookmarks?
They do have a dropdown to buttons which will do the action I want, but that’s non-intuitive and an extra click. I hate it.