You must be joking. In case you are not, what has changed over the years:
- Security: switching between kernel modes and user modes are costly; Secure coding practices take more CPU and RAM; firewalls; encryption etc.
- Abstraction: you don't have to configure select, which sound card the game uses. Applications used to manage system resources themselves, now kernel does that. It is obligatory for security.
- Graphics: resolution was 800x600, images were tiny and in 256color space (HDD speeds have not significantly improved, so then it was adequate, now you have SSD disks, which makes booting fast again), terrible video codecs (which still managed to buffer most of the time), laughable 3D.
- Useful services: automounting USB sticks, instant messaging, e-mail notifications, calendar notifications, colour corrections, system logging etc.
- Caching and indexing: since memory is cheap, just load all the data into memory, if data is no longer used, just keep it around, since it might be used again soon.
- Web has changed a lot recently. I personally use noscript to deal with lot of the bloat, but the web now has some perks I would not want to give up.