Not in the slightest. The main advantage of fleets is in trade, long distance troop movements and protecting from coastal invasion. None of this would be effected by additional land bridges.
My personal opinion is that fleets and trade are best removed altogether as the game plays better without it.
-Edit: On the subject of Wessex/Flanders, I disagree with myself earlier in the thread. This is because I used to be a "landbridge cutter" rather than a creator. This was before I realised how important they are and how much the AI is crippled by their removal. If you're playing as the Turks though as I was and want to fight endless crusades, try removing the landbridges in the straits of Gibraltar. This will force a lot of crusades to head through Constantinople and makes for a good campaign.
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