We were on Panorama this past March (me, hubs, 16 yo boy) -supposedly full as it was Spring Break time. Never had issues finding chairs on Lido, nor issues finding spots on Serenity, we did the mini golf almost every night after dinner, did the sky ride several times (usually a line here but easy to keep an eye out an hit it with smaller waits). Service was great. Even the Guys burger line seemed to move fast and it seemed no one ever wanted Blue Iguana in am?? More for me! Alchemy bar was a BLAST-we were there every night and the last night the bartenders made special "goodbye" drinks for our group (people we met at the bar that like us-showed up every night lol) Only thing that was a bit of disappointment were the comedians that sailing (usually they are quite good-this group was bad).
Do the Rhythm of the Nights excursion through Carnival-easily one of the best excursions we've ever done!
Ship size was also great-big enough it was pretty easy to find quiet spots but not so big it took 20 minutes to walk from one end to other.
Have a great time!!