1- I've been using always the command spacebar way. It brings up a thin long rectangle on the finder desktop. Command F brings a a normal old fashioned style finder window. The results can be more accurate with command F? or just more choices.
⌘-Space is the same as using the Spotlight icon. It has a lot of restrictions on where and what it can find.
2- When I do the privacy add subtract, thing, I assume the Mac is being pinged or rebooted to get new results now... Or are you saying doing that destroys all the old and it starts over from scratch? That would be insane, but I have to ask.
Your "trick" deletes the existing Spotlight index. The next time the System is rebooted it looks for the Spotlight index and when it does not find one MacOS automatically creates a new Spotlight index —
from scratch. You are not using a "feature" of MacOS, you are tricking it.
3- Many people swear by Easy Find, I too have seen it find things that Spotlight did not. But not lately at all. Have you experienced this? Maybe it went downhill?
Easy Find has not changed or gone downhill it has always been painfully slow because it opens and scans each and every file in the system for each search. I seldom used it once I discovered the Finder search option because Spotlight is infinitely faster (instantaneous) and using Spotlight in Finder has always been successful in finding what I was looking for.
NOTE: I almost always use the Finder Spotlight search option because the ⌘-Space (tool bar icon) is far less successful in my experience. Mainly because of the restrictions on that search and additionally with Finder search I not only find the file but also the path to that file.
4- What are smart folders and why are they better? Does that help with normal hardrive searches for text files?
Smart folders are essentially saved Finder searches that appear in the system as a folder. Any time a file is created matching the criteria of the search it is automatically listed in the smart folder. In iTunes the "Smart" Playlists are an application specific implementation of Smart Folders. In Photos albums are an implementation of "Smart" folders.
Click on the "Save" option near the top right of the Finder Search window to save the search and thereby create a "Smart" folder.
I would not say "Smart" folders are better, but they can be
VERY useful in automatically providing multiple ways of organizing files without creating duplicates or aliases.
HINT: If you are disciplined in tagging data files Smart folders can do a credible job of creating a file database structure using only basic functionality provided by Finder. There is a tremendous amount of power available to you, but it takes some thought and discipline to take advantage of it.