Adobes site was almost certainly done using Adobe products: Photoshop, Flash, Illustrator, GoLive, Dreamweaver, etc.
Apple I have no idea and YouTube could of (in all reality) been designed using Notepad because of the simplistic layout.
As amit pointed out, all of those sites have professional web teams working to make those sites look good and impressive. So, my advice, read read read and practice practice practice.
Read this if you want to know how to get a correct reply for your question:
^^Took that from planoie's profile^^
^^Modified text taken from gbianchi profile^^
Technical Editor for: Professional Search Engine Optimization with ASP.NET