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Key trigger would be more or less the same thing as key follow, but env follow is different.
Literally speaking an envelope follower is a type of electronic circuit that generates a control signal from the envelope of an input signal (generally the amplitude envelope). It follows slowly though, so you don't actually get a copy of the input signal, just a rough outline of the variations in its amplitude.
In an envelope-following filter, you're using an envelope follower on the input signal to automate a filter parameter, usually the cutoff. That's as opposed to automating with a manual control like a foot pedal. You can get some interesting effects this way depending on your input, and people often use it with a foot pedal or key trigger hooked up to the other parameter (i.e. follower on resonance, pedal on cutoff). The most common use is the "auto-wah", and you can hear a bit of that in this sample along with what I would imagine is a MIDI-note-controlled automation layered on top (key trigger/follower).
Tonic and Classic AutoFilter both have this effect (Tonic comes with Cubase, AutoFilter is a free plugin from Kjaerhus).
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