I agree...it is a personal choice, but if you're asking, then I'll tell you what I think.

LOL
We've done two 4-day cruises and one 7-day. For the 7-day the verandah got a lot of use and was worth the money. For the first 4-day I originally had a CAT11 booked but panicked two months prior and switched to a Cat5. I didn't feel like it was worth it for only 4 nights so last 4-day I booked a Cat11 but upgraded to a Cat8 at Port. If I were to go on a 4-day again, I'd skip the verandah and get a porthole.
The verandahs are wonderful and if you have the extra money go for it, but don't sweat it if you don't. An inside stateroom or a porthole is just as wonderful == especially for only 4 nights. There is so much to do on the cruise and so much to see and experience, that you'll probably spend less time loafing around in your stateroom.
If you don't get a verandah, you can always relax on the 'secret' decks with the comfy chairs (such as deck 7). That is a great way to get some quiet and calm moments.
Also, if you wait until you get to Port to check in, inquire about paying for an upgrade. If they're available, you'll get it at a lower price than if you called to upgrade a month or two prior to your cruise -- learned that lesson the hard way!
Overall, you're on a
Disney Cruise! You'll have a blast no matter what!
GOOD LUCK with your decision!
Happy sailing!

Melody