It sounds like the only problem with low-level PCs is survivability, and that it is mostly a question of hit points and/or massive damage.
So I suggest if you want to try ES@1 but others in your group don't, that you address that problem directly. The least intrusive house rule would be to simply remove the rule for dying outright from massive damage -- anybody who drops to 0 gets to dramatically bleed out. Alternately, instead of making the instant-death threshold equal to your max HP, make it some fixed or slowly growing value, such as 20 + 1/4 your max HP (that may also correct for the issue of high-level PCs being pretty much impossible to kill outright via massive damage). Or, give the noobs@1 some hand-wavy "get out of death free" points; like 1 point per level of the highest-level party member, and you can spend one to succeed on a death save or not die from massive damage, or something like that. My favorite house rule for this is to just give the low-level PCs the hit points and hit dice they would have if they were the same level as the rest of the party, although some people may feel that makes the game TOO easy on them. A rules-legal way to support the noobs@1 is for a high-level PC to take Inspiring Leader; the DM could even hand that out as a magic item or blessing or something. Finally, the DM could just fudge things, making sure that dangerous enemies just don't target the low-level PCs as often.