I have a 4.4i (non-servo) and a 4.6is with a non working servo. For sure, the 4.6is steering is much much heavier, probably on the same level of effort at parking lot speeds as my manual steering sports cars. At highway speeds, it's fine.

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Mike - Greater Seattle, WA, USA
2002 E53 X5 4.4i Sport Pkg Black (daily & tow vehicle)
2003 E53 X5 4.6is Estoril Blue (to replace 4.4i soon)
2002 E53 X5 4.4i Sport Pkg Silver [sold]
2001 E46 325Ci Hardtop 5MT Topaz Blue [sold]
+ Toyota track/autox/rally cars: MR2 (x2), Celica AllTrac Turbo (x3)