- Slow (remember 56k modems)
- Expensive (remember when you had to pay by the minute)
- It was the early days of the browser war, which IE was winning. Remember the "best viewed" banners. It was one of the worst times for compatibility, you had plugins too: Java, Flash/Shockwave, ...
- Search engines were terrible. Now we can write whatever is on our mind in the search box, even with typos, and 95% of the time, we get exactly what we are looking for. We like to complain about the remaining 5%, but in the late 90s it was the norm.
- The web was simply smaller, there was less information. Wikipedia didn't exist for instance.
- Ads, terrible design and annoyances have always been a thing. The 90s had popups and blink, the 2000s had flash, and we now have JS.
- Tracking, privacy and security. The 90s web was insecure as hell. Remember there used to be a popup warning you that SSL was used, plain http was the norm. It was less of a concern simply because we used to do less on the web. It was a time when people were calling you crazy for buying something online.
So no, I don't miss it. It is a piece of history that would look nice in the digital equivalent of a museum, but for day to day use... no.