Indexer can be a very useful tool, but it needs to be configured properly (i.e. the "files types" to be indexed and
not indexed need to be manually configured which can take some time). Upside, is you can use the search field in the Windows Button popup quickly if this is done.
The downsides to the indexer is it is a process, and can begin running in the background at the least opportune moments. Also, you should not keep an index file resident on a SSD (it should go on magnetic media).
I personally have mine disabled, since I know where most files are, and if I do need to search I can often get close enough that I do not have to search an entire drive. The index file also was a lot larger than I expected and its use was limited for me.