Shmups have come so far - millions of bullets on screen, fantastic sprite art, glowing hitboxes - but the idea of making scores more quickly readable seems to not have caught on, they are in most cases still just a flat, grey stick of numbers.
Gigawing and Mars Matrix are the only games I remember having more readable scores by giving the decimal points different colors, like this:

DDP DFK BL at least has the courtesy to make the higher digits slightly larger than the lower ones, though it only helps marginally in my opinion:

Maybe I´m just slow in the head for not being able to read a giant row of numbers and quickly being able to tell how many millions and billions I have. I really like the GW/MM system, add some decimal spacers in there and it might just be what I actually want.
Furthermore, I like when shmups (or scoring games in general) give you some sort of additional feedback on how well you´re doing. XII Stag, while being a slightly odd game, announced "new record!" during the stage and once again at the end of the stage whenever you broke your personal best. I believe it even had a little graph at the end.
Tetris The Grandmaster gives you medals for achieving certain goals:

I´m not talking about the typical 360 achievements here, though I have to say that despite all the dismissive comments they get from a lot of oldschool gamers I quite enjoy having these little milestones noted (within reason - I don´t need an achievement for starting up the game for the first time).
Maybe you could hear a little jingle when you reach a certain score, and get a little medal symbol during the end-of-stage score screen. It´s not like games like DDP:DFK are shy on cramming the screen full with giant numbers, stars or 10er-chips already, why not give the actual score a bit more attention?
That´s one of the reasons I enjoy collecting the medals in Batrider so much: It just feels awesome cashing in these huge max medals. It just looks cool and gives you a nice sense of accomplishment. I would love to have something visually and aurally attractive attributed to your score, like an extend jingle but not only tied to actually getting an extend. And maybe give me a rank after each stage and after Game Over, like in Ikaruga.
Am I being unreasonable here? I mean, given the emphasis most modern shmups have on scoring, I would love to see more attention being payed to showing the player when he actually did well.