Being a ditto-head here. My 2010/11 Macbook Pro has 16Gb and the original slow 320Gb drive. As soon as I feel flush enough to spring for a 500Gb SSD, then that will be the last direct physical upgrade to what is a very reliable laptop. All the other items - external storage, larger monitors - are cheap enough to swap and upgrade as needed, but the core CPU will still soldier on.
Again, to echo what has been said here, traditional laptops/desktops are at the pinnacle of their power now and have been since about 2009 or so. Tablets and phones have made consumption easier, which takes that task away from the 'PC' and moves them more to the producer side. While I like my I-devices (there are at least 7 or 8 floating around between me, the wife and the dog) I really don't like creating or editing on them. It is not as easy (yet!) as on the traditional PC.