Hera likes to chill out on my shoulders and watch me play games on the computer. I do think that they learn to trust us a bit as when I got Hera she was VERY head-shy, but now I can stroke her chin and get near her head and she doesn't freak out at all.
Btw, sometimes when I have her around my neck she squeezes all her muscles at once and it seems like she is choking me (of course she actually isn't) does this mean anything? She only does it every once in a while and to me it's like a massage, but I don't know if she is trying to tell me something or not.