Currently you have to move a slider to see its value, e.g. in th env follower. It would be much more practical if you can see the value immediately on mouse down on the slider handle - or even better on mouse over (not as tooltip, since tooltips get on nerves caused by their delay).
Envelope follower? Or Signal follower?
I’m not sure what you mean here, but the value is right next to the slider…
If you need to view it in the mixer, then just hover above the slider and wait for the tooltip to reveal the value for you.
The thing that follows envelopes, you know that thing to the left, you follow? 
I think he was talking about the filters, attack, release and so on (in the signal follower). 