don't use only 4x4s and don't put so much detail into your terrain that people have to jump over 4x4 rocks in the first place
conservation of detail is an absolute must when it comes to map design unless it's either single player or you're trying to draw attention to something in particular
Then stop trying to recreate slopes and do something original god damn it
also stop trying to pander to fps kiddies and use blockland for making lands of blocks
i mean, really. are you trying to impress 5 year olds or are you trying to impress yourself