Howdy, the main feature in ELSE is the ability to set exponential curves in the [envgen~] object. I'm really proud of this as this makes this object the most versatile and complete envelope generator for Pd by far. There's basically nothing missing I can think of (except maybe add multiple sustain points eventually).
The [function~] object can also generate exponential curves, in the same way as [envgen~], and this is cool to draw some crazy waveforms.