Yes, Four takes a lot of going through when you're being chronological! I love him and I love all his eras in different ways, but my DW rewatches tend to go... 1960s, start the 1970s and give up and eventually go back to An Unearthly Child to start again. (It's a long decade in DW!! and my faves are the 60s and the 80s.) XD

But, yeah, and pretty much everything from Full Circle on has a lot of stuff going on - you've re-achieved CHristopher H Bidmead! (You were watching it sort of in order in era, but backwards by Doctor, yes? )