Awesome info, thanks, ohfellow! And thanks for the shoutout for the wiki!
I have the trade myself, and I enjoy it, but as you say, it's not really "deep". In terms of "good" Steph cameos, I'd definitely put The Web #3 over these two, even though these two actually have a bit more ongoing power because of the connection to Robin and Supergirl. I think "Fatgirl" also comes back in the main run? Correct me if someone remembers.
The sad thing is that World's Finest is not available digitally, as far as I can tell. Not on Comixology or DCUniverse (which mirror each other, I'm pretty sure, in terms of what library is available). I do like the idea that each issue focuses on a different team up of a Superman and Batman family character, though obviously my favorite is Steph. Also, Robin is in the 4th issue, too. As we shall get to!
The Super-Titles were like that in general, with the Triangle era. I am pretty sure that this was after the Triangle era, but that whole office still had the interconnected mindset, which I think is cool. A status quo shift that major, though - I can't think of ones that are more than about a year long (NML, Superheavy).
Igle is a fun artist - he and Gates were both kinda blacklisted/treated poorly at DC after they finished their Supergirl run up (I want to say it was Didio, but I don't know if it was ever publicly attributed to him - it could be Berganaza, too.) I think he draws Batgirl very similarly to Tim Levins in Batgirl #4 - kind of "house style" without a ton of individual flair, a fairly voluptuous figure for Steph (and most of the characters), unusual considering how Nguyen, Garbett, and Perez drew her.
I actually really like the Noto covers, because I like how he did two covers for each one, each focusing on the Bat or Super character. But I'm a huge Noto fan - not everything he does (I think the cover for #4 wasn't the best, though Steph herself looked fine, and they did get less and less interesting until Artgerm took over with a huge explosion of polish), but his style in general. The covers were playing with only a few colors, leading to a bit less of a dynamic interest for some of them, but I love the variety you get with them - the playing of two sides of different concepts, and I think the way he did the last two covers (seen next week) was hilarious.
On the whole, the World's Finest miniseries felt like some talented people playing with all the Batman and Superman action figures and mashing them together. Fun, but not necessarily super meaningful. Certainly worth checking out, though!