Yes, excursions are going to be identical on any cruise line since the cruise lines have nothing to do with excursions.
There are limits on how many ships can visit the glaciers, and HAL has the oldest and best permits. We watched 2 other cruise ships, RCL and Princess waiting for our ship to pass them because HAL had the first access permit. That can be critical is ice conditions change because sometimes only one ship a day can physically get in. And of course, their on board naturalist program has won awards, but I guess not everyone is into that.
But you do bring up a good point that old time cruisers like me have to remember. (My first cruise was in 1980). The cruise industry is changing to adapt to the needs of the mass market cruiser now. Kids clubs are huge. Cruisers now longer want of expect a 3 1/2 hour gourmet experience at dinner. Our
Disney cruise was sandwiched between a HAL and an NCL America cruise. Disney was a step up in kids activities, about on par with HAL or maybe a little lower than HAL on food, where as NCL America was just basically your hotel, ALL the real activities were on shore not the ship.
Disney was the first "early to bed early to rise" cruise we were on. The Magic was empty after 10 pm except on New Years Eve, but even then everyone vaporized at 12:05 am. A long long long ways from my first cruise when the nightclub on board didn't even
open until 1:30 am!