The movie is definitely worth two hours of your life.
About fisheye and distortion : there are actually two options. (Maybe more but I'll talk about two)
1) The first is to indeed fully embrace the effect and put it to good use.
If you have a subject with curves, the fisheye will exagerrate them and that can be stunning.
And if you have a subject with symmetric straight lines, curving those might result in something unique.
2) Or you can try to hide the distortion. There are some tricks for that.
(And I am NOT talking about using the anti-distortion tools of you PP software.
I sometimes use those too to mitigate or enhance distortion if I think it looks better, but seldom to totally cancel all distortion.
Because you need so much correction for that, that you lose 50% of your image and everything in very large corners.
So why bother using a fisheye then??)
The tricks I mean are IN-camera, on the shooting location tricks.
Those tricks are actually obvious if you think about it, but still many people seem to believe fisheye shots are ALWAYS awfully distorted.
That is wrong.
The distortion is non-existing in the center of your frame and it gets gradually worse (or better if you aim for it) towards the edges.
So if there is something that you would like to keep non-distorted, but that something in or near the center of your frame (like I did with my wife: placing her near the edge would have been horrible).
And if there is an important straight horizontal or straight vertical: keep that too at or near the center of your frame.
(The late Bill Bootstrap Turner (RIP) that we know from DPR was a master of this trick : he used fisheye for landscapes and seascapes, and you could hardly tell, because he always kept the horizon of his seascapes level and smack in the center.)
This does NOT mean that your final composition has to become boring or centered...
You can always keep the straight line (eg horizon) right in the center at the time of shooting, and then crop the image.
This will allow you to move that straight horizon (or other straight line) higher or lower in the final photograph...
Or it will allow you to move that straight vertical (like a tower or flagpole) also towards the left of right.
There, that's it.
And immediately you also know why many of my fisheye images end up in a ratio of 1:1 square.
I have used the cropping recomposition trick.