When I hear decriminalized I think no criminal penalties and civil infraction only, and technically decriminalization really means no penalties. Sadly, that's not what this is.
Still, the Connecticut policy is a step the right direction.
The Denver one isn't technically decriminalization either, but it's effectively decriminalization, at least in terms of Denver city police.
Also, there are a number of other states that have reduced criminal penalties for drug possession from felony to misdemeanor, such as Oregon and California.