I guess we can also count Scenes from a Memory, the title itself is taken from a line of Metropolis, and in Home there's the line "decadent scenes from my memory".
I even made a thread about it a couple of years ago, to suggest how the albums should have been called if this rule for the name would have been applied to all albums
That's a pretty cool idea
Karma starts the signal
I remember that thread. I think I suggested
Stale Sweat and Shit for SDOIT.
Also, this wasn't really a "tradition" as much as it was something that I think happened by accident on the first three albums and then got repeated a couple times thereafter. My guess is that the notion of it being a "tradition" was borne out of MP's comment quoted below.
WDADU - In Only a Matter of Time: "And though the time will come when dream and day unite, tonight the only consolation causing him to fight in fearless faith in destiny."
I&W - In Wait for Sleep: "She shuts the doors and lights and lays her body on the bed, where images and words are running deep."
Awake - In Innocence Faded: "The faithful live Awake; the rest remain misled." In The Silent Man: "When there is reason tonight I'm awake; when there's no answer arrive the silent man."
Falling into Infinity: "Having sat with 'Stream of Consciousness' (the original title) for a whole year, it gave everyone a chance to second guess themselves. John Petrucci and myself still wanted to call it Stream of Consciousness, but the other guys were starting to think it was too pompous. So we had to rethink an album title, and we did the usual method of going through all the lyrics, but nothing really knocked us out. This was the first time that an album title didn't stem from any of the lyrics."
https://www.mikeportnoy.com/aboutmike/faq/answers/31.aspx#342SFAM - Obviously, this is named for the line in the original Metropolis, "Somewhere, like a scene from a memory, there's a picture worth a thousand words," and Home also contains the line, "The city - it calls me; decadent scenes from my memory."
SDOIT - nothing, although the title obviously comes from the idea behind the title track.
TOT - As far as I know, this title is not based on the lyrics, and my guess would be that the title, being a variation of "stream of consciousness," is sort of a resurrection of the original title of FII.
Octavarium - duh.
To the best of my knowledge, none of the post-8VM albums were titled after a lyric.