Is Bitcoin overhyped?
Definitely. There's no doubt there are alternate cryptocurrencies that are as good as Bitcoin, or even better: lower and faster transaction fees for instance. Even when BTC tx fees have pumped up to 40$ it remained popular. I think the fact that Bitcoin was the first cryptocurrency and it is 9 years old already, which is why people trust it mostly, plays a key role in its demand.
Bitcoin is the oldest and the most popular crypto currency in the world. More than half of the people around the world know about bitcoin but dont know that other crypto currencies like it exists that have better technology and applications in real world.
It can be said that the main reason for increase in price of bitcoin is its popularity among people that has boosted its price heavily along time. Popularity indeed plays key role in demand and on price of an asset.