To the druid who had to zone when aggroing one of these, my sympathies...perhaps someday when you stop pretenting to be more like other classes, you will learn the secret of the worms...
Yes, the above is meant to be sarcastic, but only because too many druids are still left without a clue. They keep getting themselves stuck in either a root-n-rot or quadding rut, and don't know how to switch tactics on the fly.
I have a 54 druid with experience in every known tactic a druid is capable of solo and in groups. Worms...they are ANIMALS! FEAR them if you don't want to deal with them...sheesh, a druid's animal fear spell will send the worm packing for the hills, and by the time the fear wears off, they will be well out of the "pursuit" radius and forget you were ever there.
ME? I charm the suckers, buff em, and off we go on a merry little hunt! I even have a hotkey made so I can stand up and re-charm the second I see the charm break. It gives me a few seconds headstart on the casting so I don't have to eat as much damage, if at all. Oh, and druids get some mob debuffs in the form of the Ro line of spells...they actually help reduce the damage taken by your pet or by the melees in your group, while making it easier for your pet or the melees to hit the mob. For example, Fixation of Ro can reduce the AC of a mob by up to 20 ponits, and their attack rating by up to 65 points (effectively reducing their damage output to that of a mob some 5-10 levels lower). Plus, Breath of Ro reduces their AC by another 20 points in addition to the damage it does!
And for the increasing number of newbs out there, the "pursuit" radius is the distance between you and the mob at which that mob will stop chasing you and return to its usual wandering or spawn location. However, be warned that unless you clear yourself from the mob's hate list, it will "remember" you and may later re-aggro from a distance of about 5 times its normal aggro radius, based on my personal observations.