A bit redundant these days perhaps, but it still works for me.
The home button on the Steam client, otoh, I click fairly often. I guess it's because it doesn't have an URL bar.
EDIT: Correction, I don't click the actual home button, but I execute the same command with a mouse gesture (via the unfortunately named StrokeIt).
For example, you don't need a New Tab button (it's not enabled by default anyway) - middle-click the Home button instead.
And if I want to create a new tab with the current URL, I middle-click the Refresh button.
So it can be quite useful for staff to got straight to the Homepage no matter whose terminal they are sitting at.
Why not use the search box in your browser? In Chrome the address bar is a search box.
I figured someone might mention this, and probably make me sound like a Luddite in the process. :-) The short answer is that I use both. If I'm at the keyboard, I will do command-T command-K to use the search box in a new tab, but often I'm using the mouse, in which case middle-click home is more convenient.
In Chrome the address bar is a search box.
I don't use Chrome; I use Firefox. The address bar in Firefox typically goes to the first Google hit for the search terms in question, which is often what I want, but it isn't a general search.
Now you can bring on the You actually use Firefox? comment. ;-)