That program is essential windows software since the stock windows search utility is basically fake. There’s no way to actually search without it.
Also I found a new good use for it recently. You can sort the entire file list by date and it updates live. So suppose you’re using a program and it saves a file without telling you where. Since it’s Windows and the file system is obfuscated to shit, there’s no way to know where it is. But it will be near the top of the Search Everything file list.