We've used the night vision goggles to view animals on the savanna from the grounds of AKL and you are correct, the picture is mainly shades of green. That was cool as a free treat but I don't know that I would go for a paid safari at night. Now, snorkeling at night on Bonaire in the 1990's was a totally awesome experience, but that's off topic.
We did do the Wanyama Safari in 2010 which was also our only trip that we purchased the Deluxe Dining Plan. I thought a lot about it before booking due to the fact that we'd be paying for a Jiko dinner that could have easily been worked into our dining plan. But we're so glad that we did book Wanyama. It's been the single most enjoyable experience we've paid extra for at WDW. Yes, our room was also on the Arusha Savannah, but not CL, and we saw plenty of animals from our balcony. We weren't eligible for the Sunrise Safari since we were not staying CL. Wanyama was done so well with two knowledgeable guides and just 6 other guests. At the dinner in Jiko we got to try far more courses then we would have on our own and each was so wonderfully paired with wine. We did manage to use up our dining credits by eating at 3 other Signature Restaurants that week plus enjoying sit down breakfasts (twice at Boma).
If you do decide on Wanyama, you could always use some of your extra dining credits to order an omelet from room service to supplement the pastries etc. that are available to you in the CL. The omelets are huge and DH & I shared one a few times when we wanted to make rope drop at a park having already eaten. They come with a few sides.
