My background is in "enterprisey" Java and I use XML in Maven, Ant, configuration files, etc. All the Java projects I worked had lots of code to map between XML and Java data structures. I tried to use XML schema and bindings but it replaces some noisy boilerplate code by other noisy boilerplate code. Using schema did help to enforce a structure but not all constraints can be expressed with it and I ended up having an additional programmatic validation phase in Java.
node.js or using a JSON to Java library for Java servers).
I don't have schema and I don't need it. A good documentation is enough in most cases (in the same way, I learn about a XML document by looking at its structure and documentation and rarely its schema).
I believe than XML (and its associated technologies) will end up as an enterprise technology and a opaque content model (e.g. to save OpenOffice documents) and be less and less prevalent on the Web where HTML (with microformats) and JSON are better suited to represent data.
(via John Gruber)