Sorry, Mr. pizza ...

Fair enough; your particular daily-use EDA app (proprietary?  you've never actually mentioned
what it is) performs worse.  You use what best supports your needs, after all.

However, my daily-use apps perform significantly better under 64-bit.  That 11% improvement
with dcraw was the only one I could recreate the benchmarks on immediately, as it's trivial to
recompile.

My main daily use app (GCC cross-compiler building a multi-million line codebase) runs
considerably faster under x86_64.  However, I no longer have an identical 32-bit system for
comparison any longer, so I can't supply benchmarks without blowing half a day on it.  (The
64-bit gnome desktop *feels* faster too, but that's obviously subjective)

One of the folks I work with has also raved about the improvements he saw using the 64-bit
versions of the particular FPGA synthesizer tools.  

Not to mention the speedup one gets by not needing bounce buffers (and other games) for I/O.