The only items inclusive on Disney but not on other mainstream lines are soda and room service. Unless you drink unusually large quantities of soda, you can avoid the charges if you bring your own soda on board or buy it at a port. All lines include a continental breakfast (same as Disney), with additional items available for a flat or per item fee. Note that Disney's menu is far more limited. Anything else that's an upcharge... is either an uncharge on Disney as well, or doesn't exist as an option. Other lines also offer packages Disney does not... if you book through a
travel agent, you can often get Princess Plus for $300pp for a week -- that includes unlimited drinks (up to $15), including canned soda, gratuities, wifi, and a limited number of premium desserts and upcharge restaurants.
Note that experience will differ more among ships than cruise lines. For example, on some Carnival ships, gelato is available in the buffet for no additional charge, there are options like Shaq's Big Chicken and a complimentary BBQ buffet on sea days (that few people know about). Most other lines, unlike Disney, include lunch in the main dining room -- typically on sea days only -- and some do tea time as well.
Princess and Celebrity are the only two mainstream lines doing room service twice daily. I've always thought this was overkill and usually ask my room to be serviced once in the evenings only. I'm certain if you tip well, any room attendant would be happy to do room service twice daily.