I miss the 90's internet. Obviously, some of the modern internet is very handy, but I miss the old days, IRC especially. I know IRC is still around, but it doesn't feel the same any more. Used to love having scripts set up to log me out about 15 seconds before my modem dropped my connection because I'd been online for 2 hours, then a script to get everything back up an running again.
Or as mentioned, using download accelerators to try and increase your download speed by a few hundred bps. Everything was just that little bit more challenging to get things done, which was annoying at the time, but it was so much more fun than it is now.
ISDN was a godsend when I got that installed. God knows how I convinced my parents to pay for it as I was only around 14 at the time we got it installed I think, and my parents have no idea about that sort of thing, and still don't.