Big is a relative word so what one person thinks are a lot of changes another might not. I think most people were waiting for the talent tree changes as blizzard shows off during blizz con or shortly thereafter and so there is this bit of a let down or feeling that nothing is going to change about their respective class.
Personally I like the direction that most of the specs are going in. Obviously we all know the specs that are in most dire need of attention more that likely due to the major overhaul they got during legion, survival we are all looking at you. Which is more than likely the reason there won’t be any major reworks this time around.