You can't really compare WWII dumb bombs dropped from 25,000 feet to modern precision weapons that can hit precisely the weakest point on a target, times thousands of targets, within the span of a few hours or days.
I mean, we literally just watched a massively successful strategic bombing campaign over the last week! Desert Storm was massively successful, Iraqi Freedom (the actual invasion, pre-nationbuilding part) was massively successful, Israel's bombing of Hezbollah was massively successful. I don't know how anyone can argue that strategic bombing with precision munitions isn't successful.
Yes, I agree that bombing random forest is not that useful.
It appears that no matter what, no matter the technology involved (maybe with the exception of nukes), you always need grunts on the ground to hold it.