Yes, there are significant advantages to using high performance gear oils all the time, even though you change it often. Not all gear oils offer the same level of protection, even for very short drain intervals. Just because two gear oils are both 75W90 with the same specs doesnt mean they are the same. Both being 75W90 has about as much meaning as saying two cars are red so they must be the same and will pick the cheapest one...its not true.
Additive and viscosity breakdown due to shear and load can happen very quickly. The quality of the gear oil comes down to the base oils used, VI improvers, EP additives etc. For example, you can make a cheap gear oil by using lower quality base oil and a lot of Viscosity Index Improvers (VI). Its a way to keep cost down vs using a high grade base oil with very high natural VI, like a Group III or PAO. The latter option is by far the best but tends to be more expensive. To make a great gear oil, you must keep the use of VI improvers down to a minimum, as VI improvers are prone to shear. So just because you change your gear oil often doesnt mean you get the same protection in that short time you do use it. Just like using poor quality motor oils. Short drain intervals WILL NOT save you from premature engine wear and other issues as the poor quality oil does not protect the metal like more expensive / better oils and will generate a ton of sludge in that short 3000 miles. Due to the complexity of lubricants engineering, its nearly impossible to tell how things are made. Having an oil meet certain criteria like GL-5, SN, API approval or whatever, doesnt say much about performance since these standards are not exactly top tier. They are a very low minimum requirement. Best way to evaluate it is to look for mentions of drain intervals and the number of OEM specs it meets. Drain intervals are pretty good indicator of quality.
Top tier gear oils meet or exceed EATON Roadranger or EATON E500 - these two specs are very hard (expensive) to meet. These are 750,000 miles gear oils. Its not the drain interval that matters really, what matters is the quality which goes into the product and is required to even approach that kind of performance. I think you will find only a handful of gear oils meet those specs, probably less than 1% of whats on the market.
A good rule of thumb is to always buy the best you can afford. If you are going to use a 75W90, use a full synthetic. Never a synthetic blend. There is no law that regulates what manufacturers can call a synthetic blend. It can be 1% synthetic and 99% mineral or 20% synthetic and 99% mineral. No way to tell.