Robustly challenge what you think are unwarranted meetings. Preface your input in meetings that are silly but still exist with "Hi, I'll keep this concise because I know everyone has a lot of work to do ...", make a habit of reconfirming the value and purpose of the remaining meetings. Make it normal for meetings to whither quickly when not vital.

I go further and simply don't attend meetings that lack an agenda or at the very least point out when there isn't one when the meeting starts.

I don't spend much time in meetings.