<blockquote>Like a thermometer the ocean equilibrates quickly, thus there is no long term ocean warming. Sounds crazy (yes!), but why should it take decades/centuries to warm? (doesn’t kinetic energy move faster than that?)</blockquote>
In water, no. Thermal diffusivity in water is pretty low, and most of the transport of thermal energy from the top few meters happens via the actual movement and mixing of the waters. (E.g., convection, not conduction).
At some depth, the water is generally pretty stratified (this dividing line is called the "thermocline"). But still, even below there, heat conduction is still too slow to get down to the bottom of the ocean in relevant timescales, so you're just basically asking how long it takes to overturn the entire oceans. Centuries to millennia.
The depth of the thermocline varies from about 200m to 1000m, so that's still a helluva lot of water that can be heated up in the next century or two, and which will slow down surface heating during that time. (For comparison, the average depth of the <i>entire</i> ocean is about 4000m).
So, nah, the ocean equilibrates <i>really</i> slowly.