France unilaterally annexed territory that the rest of Europe had fought to prevent her from taking for more than 200 years. Poland wasn't as big a deal and three major powers divided it amongst themselves.
Poland was an enormous deal. Its break-up in the years 1772-1795 completely upset the balance of powers on the european continent. If It had not been a big deal, It would not have been the casus belli for Russia post 1807.
There were different territories annexed by France. Only Britain and the United Provinces really opposed France annexing the spanish then austrian Netherlands.
Rhineland was an other matter and was a concern for the german States.
France shattered any balance of power in Europe and frankly British gains elsewhere threatened no one
You are mistaken. Russian was very concerned with Britain's worldwide colonial conquests and with its naval domination. So were the league of neutrals and the young US.