I am a big fan of XMind, but I tried a few weeks ago https://workflowy.com/.
Their concept of tags and dynamic search is really nice.
In XMind, I would like also to find quickly and see in one step / one screen all the nodes that I name "#TODO one thing to do" and search with "#TODO". I often note down some things to do during meetings, and would like to have then a global view of all these to dos of all my meetings.
I think that the best I can do is to create a node "Actions" with links to the others nodes "Actions of meeting ABC" which contains my "#TODO one thing to do" sub-nodes.
Maybe somebody would have a better idea to do such a thing?