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Usually upgrading between minor versions (12.0-12.1-12.2) is easier than upgrading between major versions (11.0-12.0) since the "gotchas" are more minor (less major changes between minor versions).
It is always possible to upgrade from old versions of Slackware up to newer versions, but as already mentioned you would have to use each respective CHANGES_AND_HINTS.TXT and UPGRADE.TXT files. You would not have to download all of the packages for each version, though.
Personally, if I were more than one major version away from the current version I would probably do a backup and fresh install. 11.0-12.2 is just one major version away, so I wouldn't mind going for it. Extra care would just be needed for the 11.0-12.0 changes.
Thanks jmhet42 for linking to my Upgrade HowTo. I hope to continue making these HowTos with each new version. All of them use the official Slackware docs. I simply elaborate on my experiences using the docs.
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