Do you use the same admin UN and PWD for different systems on small/medium LANs?

Hello,

I would like to know what people do when working on small to medium LANs in regards to their admin UNs and PWDs.

Do you use the same administrative un and pwd for everything? For (for example) AD, switches and routers, wireless controllers/config, or do you use a different set of credentials for each?

Further to that I would assume that everyone, even if they use the same set of credentials, uses a different set for different LANs or networks that they work on?

I'm aware of the dangers of using the same set of credentials across systems, which is obviously more convenient, but I would like to know what people are actually doing in real world.

Thanks.