Apparently preev.com is down right now.
Do we really need preev.com in order to check the current Bitcoin price? You could just google "Bitcoin" and the Bitcoin price comes up as the first search result. There are hundreds of places where we could check the current BTC price, most of them are cryptocurrency exchange platforms. I used to check preev.com every day in the past few years, but nowadays I don't care that much about the Bitcoin price, mostly because every price drop is very annoying to me.

I really hope that preev.com comes back online. This website has sentimental value for me and probably for most Bitcoiners.
See? Even you, also used this website. "It has a sentimental value". That alone, answers your question on why preev is important to many users here. I too use that other method you provide but what I type is "btc usd".
It will then show me the btc price. I think this trick only works with btc but for other coins, you will still need to visit one of the results that you see in your screen before you see the value of that crypto you are looking for. This is why having something like preev can come in handy. We can just bookmark it in our browser and that can save us a lot of time and effort.
Another good alternative to preev can be this >
https://coinval.co