It depends, If you see I and nothing after that it has a subjective meaning but you can guess the meaning of the rest of the sentence.
When we use me, it is completely objective, and there is no hidden meaning after that.
For example, in some cases you may hear this sentence:
You just work exactly as I . ( It means: You just work exactly as I do or as I work)
We can also use this structure:
You just work exactly like me.
The meanings of both sentences are the same but they are written in two different structures.