Thanks for the feedback!
Have you tried the sidebar filter and the button to expand/collapse all sidebar sections? Both will help you get to what you’re looking for without too much mouse movement.
We are not going to be able to prioritize the experience on sites with navigation menu set to “header dropdown” as we move forward. There will not be a “header dropdown” version of the admin sidebar.
Also we expect most sites will use navigation menu set to “sidebar” which has been the default for over a year now. If your site doesn’t need to use the header dropdown because of your own customizations which make the sidebar navigation less suitable, you should switch to “sidebar” navigation.
If you’re not able to or ready to switch now, then you might be a candidate for not enabling the experimental admin sidebar for the moment.