I agree, Excalidraw has been a revelation to me and I use it all the time to sketch out ideas/concepts, models and designs. Most diagram tools never embraced the “thinking in action” aspect of diagramming and rather focus on production of graphical artifacts for presentations. Excalidraw gets out of my way and just lets me focus on the thinking.
Miro also has a very intuitive and well thought-out UI and I like how it is like a big desk where you can work on multiple sheets/frames, move them around, connect them, zoom in/out even in real-time collaboration. But it also (like most of these apps) seems to me very business-focussed, which is fine but I think everyone should have something like this (or like Excalidraw) as a standard app on their computer, just like every OS has some sort of Notepad.
Miro also has a very intuitive and well thought-out UI and I like how it is like a big desk where you can work on multiple sheets/frames, move them around, connect them, zoom in/out even in real-time collaboration. But it also (like most of these apps) seems to me very business-focussed, which is fine but I think everyone should have something like this (or like Excalidraw) as a standard app on their computer, just like every OS has some sort of Notepad.