I find that I don't need a debugger until I do. People are always asking me what debugger I use for go and I tell them I've gone months without feeling the need for them.

However every once in a while I need to use gdb + remote debugging features to figure out a particularly weird runtime issue and I'm glad it's there.

Then I can often take the odd values I see in the debugger and start putting them into a test or a minimal repro.