According to Wikipedia:
"There are three types of boredom, all of which involve problems of engagement of attention. These include times when we are prevented from engaging in some wanted activity, when we are forced to engage in some unwanted activity, or when we are simply unable, for no apparent reason, to maintain engagement in any activity or spectacle."
I hardly ever feel bored by being prevented from doing something or maintaining engagement; if something is dull, I switch to daydreaming, rather than waiting to feel boredom. The only boredom I periodically suffer is from the unwanted activities, the ones that don't allow my brain to disengage. I feel like there ought to be another word for that, as it's an active state, not a passive one. I'm annoyed about having to do whatever it is (today it was putting together a steering group meeting agenda, and no, that sounds a lot like work, but it's regrettably unpaid.) I'm almost angry, when these things come up, that I have to either choose to do something hateful or else deal with the consequences of not doing it.
So, yes, active boredom is bad. Waiting in queues, time spent travelling, miscellaneous sitting around, having 'nothing to do' is no problem.