Taking them out of the enclosure will not make them become more docile, and when they get big enough to take you down during feeding time -- it is not a good option. I know people that needed help from their spouses because they decided to pick up the boa from the feeding tub and move them to the enclosure. When these guys get to be 6' or more, it is serious. Although they may not kill you, they can deliver a nasty bite; some of them go for the face. It is not that they try to hurt humans, it just that their feeding response is incredibly strong and reactive.
Boas are probably one of the most tolerate of people out of all the reptiles out there, as long they are handled often, not treated like crap and not bothered around feeding or shedding times. I prefer handling boas over pythons anyway, even though pythons are my favorite. I think a friend of mine might pick me up a boa this fall or this spring anyway, judging from his questions on the Internet. Usually if he get an animal, he get another one extra for a friend for some reason. So I will have to see.
What kind of plant is in that picture? I wonder how long before it get enough mass to take it down.