Lazy foragers make a big difference in my log harvest, in particular because after everything is chopped (1k-2k logs range) the lag in my case is ridiculous, and I'm probably picking 1 item every 2 seconds by hand. I use ~6 foragers for every log harvest and I'd estimate it saves me around 2 days of picking. Even after constantly doing this for thousands of days for logs and the more rare stone-fruit harvests, I still have excess orange gems as much as I do yellow.
As for treeguards and bearger, birchnuts are the way to go for me, they don't damage him much and are easy to run over. Evergreens harvests are also managable but it's a bit more work and time consuming.
Stalker is fine as well, but it feels bad to burn so many stumps, and he is also slower.
For quick clearing a small-ish area, I guess any character with glass axe and honey is enough for those jobs.