Visual Studio: Collapse Methods, but not Comments (Summary etc.)
Ctrl M, Ctrl O
Collapses to definitions.
From this point a macro might not be too hard to write.
Something like find /// <summary> ...
and toggle outlining. Then lather, rinse, repeat.
Although this question is old and answered, I was looking for the same thing as question but I think this is the simpler way than writing macro:
Tools > Options > Text Editor > C# > Advanced > Outlining
> Uncheck "Show outlining for comments and preprocessor regions"
checkbox
If you do that and than use CTRL+M
and CTRL+O
shortcut, methods will collapse but summaries and regions will remain uncollapsed.