Academics with ADHD or autism: What workplace accommodations have helped you?
This is a very difficult question to answer because people with ADHD/LD aren't treated very well in higher education in general, so (anecdotally) they seem to be extremely underrepresented among both academics and grad students. Even though ADHD/LD people make up at least 10% of the population, there doesn't seem to be much interest in diversifying faculty to include them, or in consulting with them about how to help better serve the needs of ADHD/LD students. 

Plus, there's a worse problem of fundamentally misunderstanding ADHD/LD and thinking that a few minor changes is the same thing as "accommodation." You often hear ADHD/LD described as having "attention problems" or "learning problems" (as someone on ASE did here). But in the case of ADHD, the underlying issue is actually difficulty regulating attention, which results in differences in how attention gets used. And in the case of LD, the underlying issue is difficulty processing certain information formats. In both cases, there is a significant mismatch between natural strengths/preferences and the way neurotypicals are expected to do things. (I am not autistic, but I have heard that ASD people are in a similar situation.)

The standard accommodations you mention are the product of what I call the "test in the envelope" mentality, which is as far as 99% of academics get in their understanding of ADHD/LD. It's a horrible accommodation because it sends the message that having ADHD/LD basically means that you're just like everyone else but slower. Needless to say, that creates a lot of false negative assumptions and stereotypes, especially in a career where being smart is prized above everything else. 

In other words, in the current academic environment of widespread ignorance and unwillingness to really deal with people with learning/attention differences, ADHD/LD accommodations are nearly always reactive rather than inclusive: the person with ADHD/LD has something "wrong" with them, so they posture as "needing help," for example by asking someone else check their Excel tables. This raises the question of whether it's necessary to work with Excel tables at all if it's a task that you know is going to be problematic. Is there some completely different approach that is better suited to your learning differences? What should universities be doing to provide an inclusive environment for that, rather than going small potatoes with Excel proofreading?

So at this rather benighted point in time, it might be more on-point to reframe your question as: What are examples of nonessential expectations that are typical in academia, but which put ADHD/LD people at an unfair disadvantage?