While it is true that 4e allows for custom and monster-specific attacks and conditions- one of it's clear strengths- it also has a base of uniform conditions, that are as if not more uniform than those found in 3e.
I found that the duration aspect of monster-specific (and PC-specific) conditions to be a major weakness of 4E.
This effect lasts:
until the beginning of the user's next turn
until the end of the user's next turn
until the beginning of the target's next turn
until the end of the target's next turn
save ends
until the end of the encounter
until the user forgets to (or chooses not to) use his minor action to sustain
Not only are there too many powers in 4E, both monster and player, that impose conditions, but there are two many different types of duration of conditions that have to be tracked.
There should be 3 durations: until the end of the user's next turn (i.e. a one round duration), save ends, and until the end of the encounter for a good 95% of all effects.
I do hope that 5E makes a good 2/3rds of all attacks just plain damage. Special attacks should do special things, but most normal attacks should just do damage so that the bookkeeping nightmare goes away.
I also think that more instantaneous effects can be used, even for "normal attacks". Foe is moved x squares. Foe is knocked prone. Foe is moved x squares and knocked prone. At least when using miniatures, these types of effects can be tracked with virtually no effort on the part of the player because their duration is either instantaneous, or in the case of prone, until someone stands up the miniature (prone is less nice if miniatures are not used because it has to be tracked).
But, forced movement and prone do not work well without miniatures. The solution to that, of course, is to just ignore them in a game that doesn't use miniatures.