In the first season of , there are several episodes in which the brothers have to fight ghosts. In these early years, ghosts were far more of a task than they became later on, with Sam and Dean having to fight harder to overcome the apparition.
Ghosts were far less common after Sam and Dean had to start battling gods, demons, angels, and even the Devil and God.
Though there was occasionally a ghost they dealt with, it was either far easier for them to battle these undead or there was a unique spin on the same ole to make them more formidable.
There were many that were either serious threats to the brothers or surprising allies.
However, in the first season, the brothers were very fearful of demons and had to use far different tactics to kill them (or send them back to Hell).
Before demon-killing knives and bullets, and Sam and Dean took on dozens of demons at once with little issue, demons were a more fearsome conflict.
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