So, no, we're not going to agree here. I think it's very poor play to do this. I find it annoying no matter what position at the table I'm in. As the Exploerer, it's a huge disincentive to know that any time I actually do what I'm supposed to do, I'm basically handing the spotlight to everyone else at the table because apparently, whenever we do exploration tasks, they must be played out in real time.
As a DM, I find it annoying when other players at the table lack the self-awareness to wait patiently while the Explorer is doing what the Explorer is tasked to do by the group. And, as a fellow player, I find it annoying when the DM does it to the Explorer and, again, my response will almost always be, "I wait patiently for the Explorer, who is supposed to be front and center right now, does his task.".