I would go with yes, it was a good idea. Or I should say it was the best idea we had at the moment when combating something we haven't come across since WWI (pandemic). Leaving everything as is and pretending this was just a "flu" is a childish way of adressing an issue. Was it the best solution. Probably not, but we can learn from it an come up with better solutions in the future. It sure beats the alternative, bury our heads in the sand just because we don't wan't our way of life disrupted. And I wouldn't say that the full economy was shut down, that's just false and not true.
I don't believe that going about lives normally and warning people there was a bad strain of flu going around would have been a childish way to address the issue. Quite the opposite actually. Now that we've seen the inflationary result of our actions, the uselessness of the vaccine (1% effective after 1 week), and how lockdowns simply didn't work (the countries that did nothing recovered fastest), it is shocking to me that anyone could come to the conclusion that we did the right thing. Especially when it's been acknowledged by Bill Gates himself that contracting the virus naturally led to a stronger immune resistance going forward. I stand by my decision to do nothing and end up with the strongest immunity possible.