I used Tripod but long since moved on to Livejournal, Blogger and Wordpress. My Tripod space is still out there but i wonder for how long now if GeoCities is closed?
As Paul has ratified, I think it's more the rise of the Content Management System (aka blog software), and not Facebook/MySpace (although MySpace is considerably more CMSy than FB) that has signaled the demise of Geocities. Back in the day, if you wanted a web page, you had to hack it out in HTML and then FTP it somewhere.
Nowadays, anyone who still hacks it out knows exactly how sh1tty Geocities is.
Despite whatever flaws Geocities had ... it was where my first website was, and that indirectly got me to learn HTML and JavaScript. In a sense, if it wasn't for the free websites at Geocities, I wouldn't have gotten my job as a web developer (since Computer Science in those days did not teach web development in any great detail).
I too started off on Geocities, I had a "address" on the first sub-area under Area51. (Remember when they were divided off into "suburbs"?)
Did all my coding through notepad. If there was something I liked on another website i'd look at the page source and see how it was done.
Didn't really progress much further than basic html (changing fonts, doing pictures, tables, use to be able to do frames but I think those are dead these days) but for what I do these days it's all I need. Even though i've progressed to using Dreamweaver.
ahhh the memories.