Well, of course you do when you need to. In my work, I rely upon GOOGLE for quick answers on definition (denotation), pronunciation (audio), etymology, shades of meaning (connotation), etc.
What I REALLY mean is, do you use an actual unabridged Websters, the one you get a hernia lifting? I ask because, last night, I was tired of fighting with my two ailing computers and decided to pull the big book off the shelf. It was great, hearkening back to olden times -- childhood -- when I read real books and periodicals and wrote unknown words into a notepad (the paper sort) and pored over old Noah's offerings.