Oh... yeah, we get Experience for herbing/mining now*. For example:
From what I can see:
|Herb Node||Experience to Pet |
(P at 77, H at 80, Herb maxed)
|Goldclover + Tiger Lilly||1100 Exp|
|Adder's Tongue||2611 Exp|
|Lichbloom + Icethorn||2530 Exp|
Talendra's Rose and "Frozen Nodes" are out of the way so I can't be bothered. Note also that, at 78, my Devilsaur was only getting 2457 from Adder's Tongue nodes so there's definitely a sliding scale in effect here but the best nodes to farm for Exp. appear to be AT, LB, and IT. Presumably mining nodes will provide similar numbers based on what colour they are to you at the moment, but I'm not levelling mining to find out what they are.
TLDR- "Pro-Tip": if you've a pet to level and mats to harvest - get it out.
* Note: when Cat actually hits, this will also apply to Archeology finds as currently stands.