They've change the tree from what I remember (probably ca I19 or perhaps even before). It no longer has any special uses such as blocking doors. It's just a static +Regen power which only has significant value in sustained fights (it works well at the end of the Yin TF, for example, or any AV fight). Whereas Entangle really only has use soloing at lower levels. Both are filler powers that take up slots to make them useful, so neither is particularly valuable.
Adding Entangle in place of Spirit Tree to the posted build would just require moving some powers down in the build (which is why I didn't do it). You can bump Roots and Hasten down and then either travel or your minor mez prot (that's what CJ is... with two critical cone powers, being able to move is essential... and you can put a -KB in it too).
Yeah, it just doesn't seem that great outside of a few select circumstances and the investment into it seems like it could be better spent elsewhere. I don't remember it blocking doors, haha. Granted, I came and went with this game a few times. (I hate you WoW, look what you did! =P)
A question though, how is Force Feedback recharge proc in creepers? Anyone try this? Thought about sticking it in there while leveling before I invest into all the sets to get some more uptime on it. Creepers have so many set options, it's hard to decide.