I do have to say the idea that EP has very little to do outside the main roller coasters is a bit funny to me. Other than perhaps Disneyland or Efteling I can't think of another park that has more to do if you remove the big coasters.
It does sound like you have a bad experience but there's not much the Macks can do against a day of gale force winds.
So here was my perspective, I arrived at 11:10. I did CanCan, Maudame, Ghost Castle, Voletarium, Pirates in Batavia, Arthur, and Alpen Express. I got the monorail and realized.. what the hell do I do? There is more dark rides but the quality is variable, maybe Bench?
It was around 2:30-3 when I hit this wall. I would walk around and enjoy the theming but we're in a mini storm and an awful time for atmosphere or pictures. A lot of the food places were shut (don't blame them lol), the park seemed dead which usually is a positive but going on the bumper cars with all the others cars being empty is dull lol.
I didn't even go to the Scandinavia area of the park but I just remembered fjord closes for the winter which is fair enough. Heading to the back of park for Whale Tours when it's two degrees I guess I could of done but didn't seem very worth it, especially as I doubt anyone was on it, or anything was open up there anyway.
During the summer sure there is tons to do, but like take it from that perspective and you kinda see that it isn't really magical in that scenario. Most food places are closed, 1/4 the park is practically a ghost town and the usual Europa Atmosphere unfortunately is not there. It has more content than Alton without the coasters, but only really 4 dark rides are like actually worth it. Do those 4 and ride Cancan and you're probably not missing out on much else
Imagine Alton had 4 good dark rides and Thirteen open, Forbidden Valley was closed entirely as an area and it was a stormy day. No revalidated tickets tough luck Cbeebies land was open lol. Full price ticket as well (60 euros roughly which is pricy)