+1 on that. If you want to see the webpage while you're filling in form data or entering text in a text box, then the keyboard is imperative and highly useful. But if you're used to the virtual keyboard and text box replacing whatever you're seeing, then it won't matter to you. Honestly, I think the PK was made for enterprise users who will likely do text editing in documents, spreadsheets, power points. In that way, it's indispensable. As mentioned, if you want to play on emulators (SNES, NES, Genesis, etc.), you just can't do it with a virtual pad or trackball. Sorry, just not possible.
Here's the point: When you need a PK, you'll be thankful that you have it.
But... if you don't have it, you'll learn to live with out it.