I assume that OP meant to work most of the time as a regular user. For me, I want to feel myself as a simple user too:
- less buttons
- no access to moder/admin actions
- use simple user cases
After upgrades or tune, I would like to interact with the forum as regular user see it to avoid misunderstands.
For my community admin mode is necessary only for upgrades or tests with plugins and UI. No need to be moderator all the time as well. Also I think that for some kind of people like me temporary switching to admin is better than having two accounts.
The OP wrote about sudo. This is almost the same but invert. Usually I temporary switch to anonymous to check some cases. Anyway it would be great to have some light option to activate admin mode like ‘impersonate’ under special regular account.