If you are like me, then yes it is worth getting all the DLCs. That is a decision you must make yourself though.
You do not mention the two FREE DLCs, the "Zilvermeeuw" Customs launch and the "Aquila" pilot launch, nor do you mention the "Oceana" and "Winner" DLCs. There really is quite a lot to choose from, or buy them all.
To get every thing available you could buy the Collection and the Inland shipping DLC. I'm not certain how the price would work out, nor do I know if you have the Steam version of the game or the version direct from Vstep. Prices differ depending which version you have.
Regards,
Angus.