LT Gold and LT Plat are really worthless except I guess for business/first check in privileges and priority security. Otherwise getting an upgrade cleared by being at these tiers are really not that easy. LT EXP that is something to look forward as you have comp domestic upgrades.
Requalifying as EXP year in year out serves me more than LT Plat. I do like having the mm logo on my aadvantage card.