There have always been loads of sub-genres. The stuff you mention there is very commercial.
Looking at some of my vinyl from over 10 years ago, you can compare Jonny L http://www.youtube.com/watch?v=3qo1aoR96oI with Goldie http://www.youtube.com/watch?v=x8u7MNG-ug8 or PFM feat Conrad (from '94) http://www.youtube.com/watch?v=gxcMPPoZI7s, or Roni Size / Reprazent http://www.youtube.com/watch?v=cwI0gbGEyuI.