I also think the original (0.1.0) version used a public key for identifying who funds were being sent to (making it much bigger than just using a hash of the key)
To be specific, it's uncompressed public key which barely used these days.
As well as the ripemd160 hash that also gets used which probably means the address is quite a lot smaller than an uncompressed public key.
I think there was a pay to IP option at some point too that got removed (it had quite a lot of problems associated with it - especially since communcations weren't encrypted).
Just to clarify. P2PKH or the v1 Bitcoin addresses has been around since the initial release. It is just that the mining interface and the pay to IP are both using P2PK but I doubt it is really of any concern since no one uses them anymore.