I went through dismantling first three generations of my base. In total it was several thousand buildings and it was absolutely no fun, just a chore to get these things out of the way. There's nothing creative on it, you just push button and wait, over and over again.
I assume the delay on the dismantle tool is there mainly to give you time to re-check that you're dismantling the right thing. Because if developers wanted to limit dismantling, they'd put a tax on items you get back from the dismantle instead. And in that context, having the ability to mark multiple things for dismantle fast and then perhaps go through the delay would be really useful in cases where one wants to dismantle a lot of things at once.